904L stainless steel welded tube
In recent years, the development trend of stainless steel welded pipes has been relatively good. Regardless of the scale, quality, and production technology, there have been relatively large advances, and in particular its demand areas have also gradually expanded. In addition, as the stainless stee
PRODUCT INTRODUCTION
904L is a high alloy austenitic stainless steel with low carbon content. It has good corrosion resistance in dilute sulfuric acid. It is designed for harsh corrosion conditions. It has high chromium content and sufficient nickel content. The addition of copper makes it have strong acid resistance, especially high resistance to chloride interstitial corrosion and stress corrosion cracking, less prone to corrosion spots and cracks, slightly better anti pitting ability than other steel grades, good machinability and weldability, and can be used in pressure vessels.
Chemical composition of 904L super austenitic stainless steel：
| % | C | Si | Mn | P | S | N | Cr | Ni | Mo | Cu |
| Min | - | - | - | - | - | - | 19 | 23 | 4 | 1 |
| Max | 0.02 | 1 | 2 | 0.045 | 0.035 | 0.1 | 23 | 28 | 5 | 2 |
Physical composition of 904L super austenitic stainless steel：
| Melting point / ℃ | Heat capacity ratio | Thermal conductivity | Linear expansion coefficient | Resistivity | Longitudinal modulus of elasticity |
| /kg/(kg.k)℃ | 20~300℃ | /(10-6/k) | / (Ω.mm2/m) | /GPa | |
| 50-300℃ | 20-300℃ | 20℃ | 20℃ | ||
| - | 0.55 | 12.9-18 | 16.1 | 188 | |
| Density g / cm | Hardness HBW | Hardness HBW | magnetic | ||
| 8 | nothing |
Application field of 904L super austenitic stainless steel：
*Petroleum and petrochemical equipment, such as reactors in petrochemical equipment.
*Storage and transportation equipment of sulfuric acid, such as heat exchanger, etc.
*The flue gas desulfurization device of power plant is mainly used in the tower body, flue, gate plate, internals, spray system, etc. of the absorption tower.
*Scrubber and fan in organic acid treatment system.
*Equipment for heat treatment of seawater, nitric acid, chemical industry, and other equipment.
*Pharmaceutical factory: centrifuge, reactor, etc.
*Plant food: soy sauce cans, cooking wine, salt cans, equipment and dressings.
*For dilute sulfuric acid and strong corrosive medium, 904L is the matching steel.