Features
Alloy 347H (UNS S3409) stainless steel plate is the higher carbon (0.04 – 0.10) version of the alloy. It was developed for enhanced creep resistance and for higher strength at temperatures above 1000°F (537°C). In most instances, the carbon content of the plate enables dual certification.
Alloy 347 stainless steel plate cannot be hardened by heat treatment, only by cold working. It can be easily welded and processed by standard shop fabrication practices.
Mechanical Properties Typical Values at 68°F (20°C)
| Yield Strength 0.2% Offset |
Ultimate Tensile Strength |
Elongation in 2 in. |
Hardness | ||
| psi (min.) | (MPa) | psi (min.) | (MPa) | % (min.) | (max.) |
| 30,000 | 205 | 75,000 | 515 | 40 | 201 Brinell |
Physical Properties
| Specific Heat | 0.12 BTU/lb-°F (32 – 212°F) 500 J/kg-°K (0 – 100°C) |
| Modulus of Elasticity | 28.0 x 106 psi 193 GPa |
| Thermal Conductivity 200°F (100°C) | 133 BTU/hr/ft2/ft/°F 16.3 W/m-°K |
| Melting Range | 2550 – 2635°F 1398 – 1446°C |
| Electrical Resistivity | 72 Microhm-cm at 20°F |
How To Make 347 Stainless Steel Strips
The raw materials of 347 steel 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 347 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.
During this step of the precision 347 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 347 stainless steel strips products with 0.08mm thickness.
In this step, the metallurgical process is performed on the whole 347 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 thin 347 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.
Cleaning the residual oil on the surface of the thin 347 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 stainless steel strips.
When thin 347 stainless steel strip is rolled on a twenty-high rolling mill with a thickness of 0.08mm-1.0mm, 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.
For high quality 347 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 0.08mm 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 347 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.
