444 Stainless Steel Strip
Are you looking forward to having a plan or coming up with an idea to buy 444 stainless steel strip product for food processing systems, hot water tanks, heat exchanger tubes and automotive parts manufacturing?
Here you’ve come to the right place.
Check out the following buyer’s detailed guide for project engineers, operators and beginners, we’ll offer you the high quality stainless steel strips solutions with 24/7 custom service to fit your every idea and plan.
What Is 444 Stainless Steel Strip
Grade 444 stainless steel strip, also called 1.4521 ferritic chromium stainless steel strip.
Grade 444 stainless steel strip is a ferritic chromium stainless steel with molybdenum in addition.
Compared with commonly used grade 430 stainless steel strip, it has high chromium content.
This stainless steel has good resistance to pitting, crevice corrosion and stress corrosion.
Its corrosion resistance is even better than 304 stainless steel strip and 316L stainless steel strip in some applications.
The yield strength of 444 stainless steel strip is equivalent to 1.5 times that of carbon steel strip, and it has extremely high characteristics such as impact resistance.
Waht Are 444 Stainless Steel Strips Applications
Grade 444 stainless steel strip is a nickel-free, molybdenum alloyed ferritic stainless steel with very good corrosion resistance, good cold formability, and high strength.
It has been widely used in following industries:
- Hot water tanks
- Drinking water pipes
- Food processing equipment
- Heat exchanger
- Solar energy collection panel
- Other Parts
444 Stainless Steel Strip Chemical Composition
The chemical components of grade 444 stainless steel strip is summarized in the following table:
| Grade | Standard | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 444 (EN1.4521) | ASTM A240 | ≤0.025 | ≤1.00 | ≤1.00 | ≤0.04 | ≤0.03 | 17.5~19.5 | 1.75~2.5 | ≤1.00 | ≤0.035 | |
444 Stainless Steel Strip Mechanical Properties
The mechanical properties of grade 444 stainless steel strip is summarized in the following table:
| Rm – Tensile strength (MPa) | Rp0.2 0.2% proof strength (MPa) | A – Min. elongation at fracture (%) | Rockwell | HB |
| ≥ 415 | ≥ 275 | ≥ 20 | ≤ 96HRB | ≤ 217 |
How To Make 444 Stainless Steel Strips?
1. Raw Materials Preparation
The raw materials of 444 stainless steel mother coils are purchased from China well-known manufacturers, and every batch of goods is said to be genuine.
Each batch of goods has a product quality certificate issued by the origin manufacturer.
Our company will also conduct full inspections on the raw materials sent to the factory, and select raw materials for sampling and use for spectral testing.
The spectral testing can roughly detect the ingredients contained in the raw materials. We will check with the manufacturer’s quality certificate. Make a comparison and confirm that the materials are correct.
Checking details include products thickness tolerance, width of coil, outside packaging, label marks, inside surface finish, chemical components, etc.
We will also save some raw materials and finished products of precision 444 stainless steel strips, and send them to qualified testing institutions on a regular basis, so that the testing institutions can use professional instruments to test our precision stainless steel strips and raw materials.
For full quality control, ensuring that our products are in compliance in every standard of the national technical specifications.
2. Cold Rolling
During this step of the precision 444 stainless steel strips manufacturing process, a cold rolling mill is used to achieve the final desired thickness of the steel strip coil, a machine that also ensures the quality of the good surface finish, the flatness of the strip and the variation of the thickness to match with the international standards.
We have to mention that the twenty-high rolling mill equipment.
Twenty-high rolling mill, including stand, roll system, roll box, pressing device and driving device.
The thickness of the produced stainless steel strip can be up to 0.001mm. The rectangular saddle and the housing are easy to process, the matching accuracy is high, and the lower roll box is easy to adjust and make the rolling line maintain a standard height.
After cold rolling process, we can achieve the super 444 stainless steel strips products with 0.05mm thickness.
3. Bright Annealing
In this step, the metallurgical process is performed on the whole 444 stainless steel strip body.
Through the heat treatment, the microstructure of the strip material is altered in order to provide the desired mechanical properties while on usage.
The 444 stainless steel strip is processed for bright annealing treatment. The strip can be fast cooled by the the continuous annealing line.
The traveling speed of the thin stainless steel strip on the line is around 60m~80m/min.
4. Degreasing
Cleaning the residual oil on the surface of the thin 444 stainless steel strips due to the stains during the rolling process.
The principle is to use the chemical reaction (saponification reaction) between the alkaline agent and the grease on the surface of the steel strips to remove the grease.
In order to wash them off, hot alkaline rinsing is performed.
The speed of the whole cleaning unit line is about 60meters/min, which can handle 0.08mm-1.0mm thickness 444 stainless steel strips.
5. Tension Straightening Process
When thin 444 stainless steel strip is rolled on a twenty-high rolling mill with a thickness of 0.05mm-0.5mm, it is a difficult-to-deform metal strip condition.
Under the condition of complete softening and large tension leveling, the use of stretch bending straightening is the only method that can eliminate the stress of steel stainless strip.
The tension leveling is performed by means of a skin pass mill, a machine that, in addition to improve the mechanical properties, which helps to improve the final brightness of the steel strip. That way, the desired features of the final strip product are guaranteed.
After straightening process, the stress distribution in the entire stainless steel strip is more uniform and the plate shape is more straight.
The excellence control and management to production process assures the straightness of each stainless steel strip with variety hardness temper.
6. Slitting Process
For high quality 444 stainless steel strips slitting process, our staff will use the precision and small machines to cut the narrow coils. Thickness of roll coils is from 0.05mm to 3.0mm.
Our workers will make adjustments between finished coils and cutting tools when they are preparing to slit in order to minimize the burr of strips edge as much as possible.
The precision thin 444 stainless steel strips manufacturing process ends with the slitting, where slitting knives of the highest precision are used to obtain the final width and burr level of the cold rolled precision strip stainless steel.
What Is 444 Stainless Steel Strip Packaging
Our company have professional team who can adopt developed packaging technology to assure no any damages of 444 stainless steel strips products during transportation.
- Standard export packaging:
Waterproof Paper Winding+PVC Film+Strap Banding+Wooden Pallet or Wooden Case; - Customized packaging as your request (Logo or other contents accepted to be printed on the packaging);
- Other special packaging will be designed as customer’s request;
- Eye to wall and eye to sky are both available;
- By International Express: DHL/UPS/FEDEX/EMS and our own express line;
- By air or By sea;
- Shipping port: Shanghai, Ningbo or as your request.
Precision 444 Stainless Steel Strips Manufacturers: Which Is Right For You?
In the current stainless steel strips market, the quality is already a lot of manufacturers to abandon, and how to save production costs, to win the price of every tender from customers has become their only standard.
So if you are in precision 444 stainless steel strips area, you are not only need the supplier, but also a long term business partner.
HZW has several years of production high quality stainless steel strips experience which make it an ideal choice for you.
We revise the orders and take thorough insights before forwarding the order to the final production line. This makes sure the every production is carried out in the most effective manner with zero errors.
If you want to purchase 444 stainless steel strips products, why not contact us here for saving your time and money?
