Your Reliable Partner and SS Coil Manufacturer in China
You know the importance of the sturdiness of raw material if you want to build a sturdy building or to set up strong machinery. SS Coil by Sunnyda is not a regular supporting material. It has enhanced properties for enhanced strength.
Sunnyda has earned its name in the market by providing premium quality SS Coils. We are striving to create products that are not just affordable but also useful for various applications. Let us make your buildings and industries stronger and more productive with our export-quality Stainless Steel Coils.
Promising maximum productivity and outcome, SS Coils by Sunnyda are designed with the help of our experienced team of professionals who have been excelling in this field for years. No corrosion, no rusting, and high conductivity!
What else are you looking for? Our Stainless Steel Coils are made to withstand maximum pressure yet offer increased durability. Sunnyda is determined to create user-friendly Stainless Steel Coils to help you fulfill your dreams. Get the best treatment and guidance from our highly professional staff that will guide you through each product. Our customer care service is available 24/7.
Make a call for the best use of your time and resources to build a long-lasting and productive business setup.
Ultimate Guide to SS Coil
SS Coil- A Complete Buying Guide by Sunnyda.
Are you looking for a sturdy raw material for your buildings and industrial equipment? An SS Coil must be your first choice since it has all the properties of a perfect material for your kitchen appliances, buildings, and industries.
SS Coil stands for Stainless Steel Coil that is used for support and shape of machinery as well as buildings.
An SS Coil has a lot of desirable features including being lightweight, with anti-rust and anti-corrosion properties.
As there are different grades and qualities of an SS Coil, it comes with an easy maintenance routine and therefore is a user-friendly choice.
This guide contains all the basic information about an SS Coil, its uses, how it’s made, and how to maintain it. So let’s start.
1.What is an SS Coil?
2.What are the Features of an SS Coil?
3.What is the Specification of an SS Coil?
4.What is the Manufacturing Process of an SS Coil?
5.What is the Manufacturing Equipment Used for an SS Coil?
6.What are the Different Grades of an SS Coil?
7.How is the SS Coil Different from Carbon Coil?
8.Is an SS Coil Better than an Aluminum Coil?
9.What is the Difference Between Hot Rolled and Cold Rolled SS Coil?
10.How to Produce Galvanized SS Coil?
11.What are the Typical Applications of a SS Coil?
12.What is the Chemical Composition of an SS Coil?
13.What is the Processing of an SS Coil?
14.What are the Instructions for Welding of an SS Coil?
15.How to Avoid Corrosion in an SS Coil?
16.How to Get Rid of Rust from an SS Coil?
17.What are the Instructions for Painting an SS Coil?
18.What Factors do you need to Consider while Plating the SS Coil?
19.What are the Rust Removal Methods for an SS Coil?
20.What are the Safety Precautions for an SS Coil?
What is an SS Coil?
An SS Coil is one of the most required raw materials which is used in manufacturing industries and the construction of buildings.
Made up of corrosion-resistant and sturdy material, SS Coil is the first choice for making kitchen appliances, industrial equipment, and machinery parts.
It is not just strong but also has great physical and mechanical properties, which make it ideal for a wide range of uses.
Being available in various sizes, grades, and forms, it is resistant to rusting and therefore is great for outdoor as well as indoor use.
An SS Coil is easy to maintain and requires little attention to keep it in perfect condition.
Another great property is that it is lightweight. It comes in different grades and qualities. You can choose the best one according to your application.
What are the Features of an SS Coil?
Here are a few prominent features of an SS Coil;
Variety and Diversity
There are several different forms of an SS Coil that support various applications. Every application requires a special kind. Therefore, the range of variations serves the purpose.
Any technical issues related to your application can be simply handled with the help of a good quality SS Coil. It is based on recent technology and therefore leads towards increased productivity.
Having access to the most recent technology, a Stainless Steel Coil exhibits great quality and makes the working of your application.
The flawless finish and the smooth surface prove that it has been manufactured with extreme expertise.
What is the Specification of an SS Coil?
Following are a few specifications of an SS Coil;
- It is available in several shapes such as slip, roll, or coil.
- The treatment can be either Cold Rolled or Hot Rolled depending upon the circumstances and properties.
- The thickness of Hot Rolled SS Coil is 3 – 12mm and that of Cold Rolled is 0.3 – 3mm.
- The grade can be AISI 201 / SUS 201 / S20100 / 1.4372
- The width range usually lies between 10 to 2000mm.
- The length of your SS Coil can be customized according to your choice.
- There is an option between mill edge and slit edge.
- The standard size is 1000mm x coil mm, 1500mm x coil mm. For 4′ ———-1220mm x coil mm and for 5′ ———-1524mm x coil mm.
- The surface is protected with PVC film or paper and it comes as brushed, HL, BA, 2B, 8K Mirror, Etched, Embossed, and No.1.
- The standard can also be customized according to your liking however the most general one is ASTM A240/A240M. Another available standard is ASTM, AISI, SUS, JIS, EN, DIN, GB, ASME, etc.
- Standard export sea package is offered that is bundled with steel strop and waterproof kraft paper.
- MTC and SGS certification is also necessary.
What is the Manufacturing Process of an SS Coil?
The manufacturing process of an SS Coil is as follows;
- It all starts from a reheat furnace where the stainless steel slabs undergo hot rolling.
- The temperature for this process has to be specifically adjusted at a setpoint.
- This certain setpoint is named recrystallization temperature.
- Every grade of an SS Coil has a different recrystallization temperature but usually, it lies between 1,100° C to 1,300° C.
- The manufacturing process for different grades also varies slightly.
- Now the steel slabs are made to run through the rolling and heating mills.
- This step needs precision because there are two processes simultaneously running side by side.
- The next step is annealing and prickling in which the stainless steel slabs are polished and made smoother for a perfect finish.
- The surface is made brighter and any oxide layer is removed. This step also deals with the removal of any impurities in the SS Coil.
What is the Manufacturing Equipment Used for an SS Coil?
The manufacturing equipment used in the different steps of the formation of SS Coil is listed down below;
From Cold-Rolling to Annealing
- Cooled rolling is used to roll pickled coils. It rolls coils to a particular thickness.
- By cooled rolling, crystal grains of SS Coil will be enlarged which makes the texture hard and brittle.
- The coil is heated to form uniform crystals in a reductive atmosphere in the annealing process.
- The crystals form meets the specified requirements and standards.
Continuous Casting from Blast Furnace
- A chemical reaction carried out in a blast furnace with sinter and coke produces pig iron.
- Then pig iron is passed through the following four steps to meet the durability requirement.
- The four steps are hot metal pretreatment, converter process, secondary refining process, and continuous casting.
- These steps produce the product slab that is free from excess carbon and impurities.
From Hot-Rolling to Pickling
- The high-quality SS Coil with the flawless surface condition and high internal quality is produced by controlling the roll surface condition and temperature.
- A computerized system is used to control all the processes like starting from feeding to the reheating furnace to the completion of coiling and line processes.
- After all this, the pickling process makes the surface more flawless by removing the surface scale.
What are the Different Grades of an SS Coil?
The grading system of SS Coil is a way that categorizes metal based on different factors and it is known by the name steel grading system.
The factors can influence the properties and uses. For example, during the cooling process of rate steel, it will go through the different critical temperatures and the temperature used will depict how its molecules will join together.
Two steel having the same alloy can have different grades because of different heat treatment processes.
A letter prefix and a number are assigned to each metal based on its category and specific properties of the metal by the ASTM Grading System. For example, iron and steel materials are given a designation A.
In contrast, a four-digit number is used by the SAE Grading System for classification.
The steel type and alloying element concentration are defined by the first two digits whereas the last two digits of the number define the carbon concentration of SS coil metal.
How is the SS Coil Different from Carbon Coil?
Chromium content and nickel in some cases are the major difference between carbon coil and SS Coil.
Stain resistance and more rust in carbon coils are the results of adding chromium to the carbon coil, whereas mechanical properties such as density, strength, and heat capacity are enhanced by the addition of nickel.
An SS Coil is used in the manufacturing of containers, machinery, etc.
Except for other elements carbon, silicon, manganese, sulfur, and phosphorus, are elements that are available in large quantities in carbon coils. Due to which it has fewer alloying elements than SS Coil.
The carbon coil is suitable for different applications because of its variety of grades and thickness.
Is an SS Coil Better than an Aluminum Coil?
It is important to discuss the difference between SS Coil and aluminum coil to decide which one is better;
Generally, both these metals are frequently used in buildings, cutlery, household items, kitchen appliances, etc. however both have different properties.
The Ratio of Strength to Weight
Bicycles and airplanes prefer to use aluminum because it is three times lighter than stainless steel. Automotive also use aluminum extensively. This is owing to the strength-to-weight ratio of aluminum.
It is better and much more reliable than that steel. Though stainless steel is stronger, aluminum serves the purpose well where low weight and high strength are required.
The strength of An SS Coil is higher.
Since steel is very heavy, it has much more strength than aluminum. Therefore an SS Coil would be much stronger than an aluminum one.
Aluminum has the properties to resist rusting. However, this is not the case with stainless steel. It has added chromium which helps in resisting corrosion even more. Therefore, we can say that an SS Coil is more preferable.
The prices of both aluminum and stainless steel are equal. As aluminum is lighter, it happens to be more cost-effective.
Aluminum is a much easier metal to deal with. It can be easily bent into a lot of shapes and desired angles and it will not break. It can be bent as well as cut. Stretching and manipulating are also very common with aluminum. However, this cannot be done so easily with an SS Coil.
If you need to work at higher temperatures, you might go with an SS Coil. Otherwise, aluminum is an excellent conductor of heat and electricity.
What is the Difference Between Hot Rolled and Cold Rolled SS Coil?
- Semi-finished products are used for the production of the hot-rolled coil.
- Through rolling and annealing, the semi-finished products are converted to a certain thickness and wound to make a roll.
- It has many uses that include the manufacturing of pipes, tanks, and steel doors. It can also be changed in cold-rolled SS Coil after further processing.
- The hot-rolled coil can turn into a cold-rolled SS Coil by passing it through a process.
- The process includes pickling of the hot-rolled coil in a weak acid solution and then performing processes like washing, brushing, drying, oiling, and unrolling the sheet.
- The last step of the process is to pass the SS Coil through the mill which is reducing, that too, under pressure.
- A Cold Rolled SS Coil is better than hot-rolled coils in terms of smoother surface, thickness, width, length, and greater strength.
- Cold rolled SS Coil is majorly utilized in the automotive industry and sometimes in the manufacturing of household goods.
How to Produce Galvanized SS Coil?
- Galvanized SS Coil production involves the coating of Hot Rolled and Cold Rolled Coils into zinc.
- The coating can be done by two procedures that are hot-dipping or electrolytic deposition.
- If the coating is done by the hot dipping process, then no other coating is required to protect it from corrosion.
- The material electrolytic deposition method involves a thin coating of zinc that’s why it is not used for corrosion-resistant application without an additional coating of paint or chemical treatment.
- Pure zinc is converted into zinc/iron alloy coating by going through a special heat-treating process to produce Galvanized SS Coil. It is used in the automotive industry and the production of roofing materials.
What are the Typical Applications of a SS Coil?
There are a few typical applications of an SS Coil;
- Truck trailer posts
- Door frames
- Piston rings
- Transit car structural members
- Transit car roofing/siding
- Thermal window spacers
- Hose clamps
- Airbag containers
However, an SS Coil is also used in the following fields;
- Construction material
- Medical equipment
- Electric equipment parts
- Chemical tanks
- Food industry
- Steel furniture
Machines that use an SS Coil include;
- Washing machine
- Dry batteries
What is the Chemical Composition of an SS Coil?
The chemical composition of an SS Coil has to be very precise. The most common chemicals and their percentage has been listed down below;
- Nitrogen: ≤0.25%
- Chromium: 16.0-18.0%
- Phosphorus: ≤0.06%
- Carbon: ≤0.15%
- Sulfur: ≤0.03%
- Nickel: 3.5-5.5%
- Manganese: 5.5%-7.5%
What is the Processing of an SS Coil?
- The processing of an SS Coil is an elaborate procedure involving many steps.
- It is processed under temperatures 1850-2000°F.
- It is necessary to rapidly cool it at 1500 – 800° F to avoid sensitization and keep carbides in the solution.
- No other treatment than cold working can make it hard.
What are the Instructions for Welding of an SS Coil?
The welding method and welding skills are very important for SS Coil. The method to be used depends upon the desired appearances and strength of the SS Coil manufacturer. Following methods can be used for welding of SS Coil;
1. Resistance Welding
Following are two types of Resistance Welding for an SS Coil
To achieve sufficient strength the welded joint should be in nugget form.
Continuous spot welding is known as seam welding. The seam welding requires 1.5 to 2.0 times greater current and 1.2 to 1.6 times greater pressure than spot welding.
2. Gas Welding
Gas welding uses JIS Specification Z 3201 rods and the highest grade of acetylene.
3. Submerged-Arc Welding
It uses JIS Specification Z 3211 and the highest grade of oxygenation titania or lime titania as they produce outstanding bead appearance and penetration.
How to Avoid Corrosion in an SS Coil?
To prevent corrosion on your SS Coil, you can opt for any of the following procedures;
Use Salt Spray
Salt corrosion resistance can be greatly increased by using the salt spray exposure testing technique.
If the uncoated SS Coil is compared with salt spray exposed surface, there will be a clear difference as the former will be rusted and the latter will be just like new. In this way, life is increased by days and years.
Use an Acid
As high amounts of concentrated acid can be harmful to any surface, it must be used in moderate quantities.
The acid can increase the durability of your SS Coil by months to years depending upon thestrength of the acid and the composition of the coil.
It also helps to improve the chloride immersion resistance thus making it more rust-resistant and more trustworthy for your application.
How to Get Rid of Rust from an SS Coil?
To get rid of rust from your SS Coil, you may follow any of the below methods;
1. Use Phosphoric Acid
- Phosphoric acid is the first choice for the removal of rust because it does not disturb any other components of an SS Coil and only attacks the oxide part thus dissolving it.
- As it is not aggressive and dangerous, it can be easily availed from any nearby store. You must wash it with deionized water to get rid of any acid remains. You can use distilled water if deionized water is not available.
- This method is not always helpful but it does work to some extent.
2. Use Acetic Acid
- When the corrosion is on a larger surface area, acetic acid is a better choice because it carries out a mild reaction.
- It gives off a slower reaction than that of phosphorus and therefore it is more effective.
- Again rinse it with deionized or distilled water so there is no acetic acid left on the surface.
What are the Instructions for Painting an SS Coil?
Painting is used to protect cooled rolled SS Coil from rusting and for ornamentation purposes. So it is necessary to use a suitable painting method.
The method should be selected based on the shape of the product and the environment to be used in.
The simple method involves three steps; degreasing, painting, and drying.
Method to be used for durability
It involves four steps: degreasing, chemical treatment, painting, and drying.
What Factors do you need to Consider while Plating the SS Coil?
To protect SS Coil from rust, oil is applied to it. The oil used may stay on the surface after the rust protection process.
Removing all traces of the oil is necessary before plating the cooled steel sheet. You can do it using the following methods:
You can utilize emulsions and alkali cleaners to get the best results. Alkali cleaner is recommended more than others as it is easy to handle.
The most commonly used alkali cleaners are Caustic soda, carbonic soda, and silicate soda. Factors like time, temperature, and agitation are very important.
Degreasing effects are enhanced by adding a surface activator to the solution.
The pickling method should be used for the removal of Oxide film and rust from the surface of SS Coil.
The most common type of pickling solutions used is Warm sulfuric acid or hydrochloric acid. However, roughness and/or hydrogen embrittlement are the main causes of pickling and poor plating is the cause of under pickling.
For satisfactory picking, you need to use the right amount of inhibitor and conditions that result in slight over pickling.
Method of Checking Surface Cleanness
Use the following method to check surface cleanness of SS Coil:
Judgments Regarding Water Behavior
A water spray test can be used to test the surface cleanness of a steel sheet. However, making judgments can be difficult if droplets are too small.
Performing the atomizer test involves the spraying of water 5 to 10 vertical onto the test specimen.
The spray should be applied properly so that the sprayed area should be distinguishable from other parts. Other methods are based on the results of test plating.
What are the Rust Removal Methods for an SS Coil?
Cooled steel sheet should be treated with an oil that can easily be removed and has low viscosity for maximum protection against rusting and enhancing degreasing.
As oil is applied to the sheet in a minimum amount, the SS Coil may start rusting after a long time of unpacking.
So it is necessary to use them promptly. If you need to keep the steel sheet unpacked for a long time for production, keep the following factors in mind
Places that have humidity less than 60 are perfect to keep SS Coil as humidity above 60 accelerates rusting.
Rusting is also affected by air pollution.
Some substances accelerate rusting even when humidity is 60 or below. These substances include hydrochloric acid gas, ammonium chloride gas, and seawater salt particles.
Dust and contaminants are another cause of rusting. It breaks the oil layer which produces local galvanic activity.
What are the Safety Precautions for an SS Coil?
Following are a few conditions that can result from inappropriate use of an SS Coil;
- Due to repeated and prolonged exposure, it can damage the organs thus leading to organ failure.
- It is extremely harmful if any bits are swallowed.
- Inhaling or smelling it can also cause headaches, nausea, allergies, asthma, and other breathing disorders.
- It is also capable of causing respiratory irritation or skin rashes or allergy.
The safety precautions for an SS Coil are as follows;
- Always wash your hands after handling them.
- Never try to inhale or ingest a part of it.
- Choose a well-ventilated area to use if required to work for long hours.
- Avoid smoking, eating, and drinking while being around your SS Coil.
- If your clothes have been contaminated while working around it, you must change them before you to a public place.
- Before use, seek any special instructions or precautionary measures.
Before you purchase your SS Coil, you must gather sufficient data about its features and uses.
With proper care and handling tips, you can get maximum productivity from your SS Coil.
FAQs of SS Coil.
- Why is an SS Coil Safe?
An SS Coil is safe because it is a medical-grade raw material. Also, it is used in areas where low resistance is required.
- What is Preferable Over an SS Coil for Temperature Control?
Although an SS Coil is also suitable for Temperature control. However, in some cases most importantly nickel and titanium are preferred for such cases.
- How can you Check your SS Coil?
You can check your SS Coil by any of the following methods;
At room temperature, put one drop of strong nitric acid on the surface. If it is affected by nitric acid, it will have a pungent four and brown fume.
- Why is the SS Coil Better than Kanthal?
An SS Coil is better than Kanthal because it offers low resistance and has a faster ramp. Also, it can be easily molded to any shape and it holds its position well.
- How can you Use SS Coil for Wattage Mode?
You can use wattage mode if your device does not have any SS settings for temperature control.
- What is the Most Commonly Used Stainless Steel in your SS Coil?
The most commonly used stainless steel for your SS Coil is 316L.
- What is the Difference Between 304 and 202 SS Coil?
304 is considered to be more corrosion resistant and strong as compared to the 202 SS Coil. However, 202 is much more affordable and is also used in several applications.
- What is the hardest grade of SS Coil?
420 SS Coil is the hardest grade and therefore it is used in engineering applications. However, 440C SS Coil is the strongest one. There are no chances of any abrasion on it.
- How can you check the Grade of your SS Coil?
To check the grade of your SS Coil, you can use the AES system or the ASTM system.
- How is an SS Coil Better than an SS Sheet?
An SS Coil is better than an SS sheet because it maintains automatic and continuous processes. Also, it increases the yield and productivity of a process. A sheet is cut from the coil so it can be called a part.
- What is meant by Stretcher Strains in an SS Coil?
When there is any pressure or force applied on an SS Coil, wrinkles may appear. These wrinkles are termed stretcher strains.
- How to Avoid Stretcher Strains on SS Coil through Cold Annealing?
If the material is properly cold reduced during the process of annealing, there is little chance of the appearance of stretcher strains on the SS Coil.
- What are Predisposing Factors of Wrinkling on a Stainless Steel Coil?
The predisposing factors of wrinkling on an SS Coil are the nitrogen content, degree of forming parts, solid carbon, and temperature.
- What is the importance of Cold Rolled SS Coil?
A cold-rolled SS Coil is important because it is used in applications where precision is required. It is easily formable and therefore it is used in metal furniture and school lockers.
- Does a Cold Rolled SS Coil have High Ductility?
Due to processes involving cold working, a Cold Rolled SS Coil has increased ductility. The reason is wire drawing, deep drawing, and cold rolling.