Yuhong Group Co.,Ltd
| MATERIAL | UNS N08904 / 904L /1.4539 |
| Payment Terms | L/C, T/T |
| SURFACE | Polished, Pickled , Bright Annealed |
| Delivery Time | 7DAYS |
| TYPE | SEAMLESS,WELDED |
| Packaging Details | Plywood Case /Iron Case/ Bundle with plastic Cap |
| STANDARD | ASTM/ASME B677 / B674,ASTM A312 |
| Model Number | ASTM/ASME A312 B677 / B674 UNS N08904 / 904L /1.4539 |
| Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001 |
| Place of Origin | CHINA |
| Brand Name | YUHONG |
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Product Specification
| MATERIAL | UNS N08904 / 904L /1.4539 | Payment Terms | L/C, T/T |
| SURFACE | Polished, Pickled , Bright Annealed | Delivery Time | 7DAYS |
| TYPE | SEAMLESS,WELDED | Packaging Details | Plywood Case /Iron Case/ Bundle with plastic Cap |
| STANDARD | ASTM/ASME B677 / B674,ASTM A312 | Model Number | ASTM/ASME A312 B677 / B674 UNS N08904 / 904L /1.4539 |
| Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001 | Place of Origin | CHINA |
| Brand Name | YUHONG | ||
| High Light | Stainless Steel Seamless Pipe ASME SA312 ，Stainless Steel Seamless Pipe TP904L ，Stainless Steel Seamless Pipe UNS N08904 | ||
STAINLESS STEEL SEAMLESS PIPE ASME SA312 TP904L B674 UNS N08904 1.4539
TP904L is a high-alloyed super-austenitic stainless steel (UNS N08904, W.Nr. 1.4539) designed for exceptional corrosion resistance in highly aggressive environments. By adding molybdenum (Mo) and copper (Cu) to the chromium-nickel matrix, its performance far exceeds that of conventional 304 and 316L stainless steels, particularly in reducing acid media and chloride-bearing solutions.
Why 904L is "Super" Austenitic
1. Superior Resistance to Reducing Acids – The combined addition of Mo (4.0–5.0%) and Cu (1.0–2.0%) is the key. This enables 904L to withstand sulfuric acid up to 70°C (158°F) at various concentrations, and phosphoric acid and acetic acid over a wide range. It also provides excellent resistance to chloride-induced pitting, crevice corrosion, and stress corrosion cracking (SCC).
2. Extra-Low Carbon & Weldability – The ≤0.02% carbon content prevents chromium carbide precipitation at grain boundaries during welding. This effectively eliminates the risk of intergranular corrosion, giving 904L excellent weldability without the need for post-weld heat treatment in most cases.
Key Limitations & Selection Notes
Temperature Limit – 904L is not designed for ultra-high-temperature service. Its recommended maximum long-term operating temperature is approximately 450°C (840°F). Above this, its mechanical strength and creep resistance diminish significantly.
Specific Media Limitations – While excellent in reducing acids, 904L performs worse than molybdenum-free stainless steels (e.g., 304) in strongly oxidizing acids like nitric acid. In hydrochloric acid, it is only suitable for very low concentrations (1–2%).
Some of the quality tests carried out by us includes:
| Corrosion Test | Conducted only when specially requested by the client |
| Chemical Analysis | Test done as per required quality standards |
| Destructive / Mechanical Testing | Tensile | Hardness | Flattening | Flare | Flange |
| Reverse-bend and Re. flat tests | Carried out in full compliance with relevant standards & ASTM A-450 and A-530 norms, which ensures trouble-free expansion, welding & use at customers end |
| Eddy Current Testing | Done to detect homogeneities in subsurface by using Digital Flaw-mark Testing System |
| Hydrostatic Testing | 100% Hydrostatic Testing carried out according to ASTM-A 450 norms for checking tube leakage, and biggest pressure we can support 20Mpa/7s . |
| Air Under Pressure Test | To check any evidence of air leakage |
| Visual Inspection | After passivation, every single length of tubes & pipes is subjected to thorough visual inspection by trained staff for detecting surface flaws & other imperfections |
904L Chemical Composition %
| C | Cr | Cu | Mn | Mo | Ni | P | S | Si |
| Max | Max | Max | Max | Max | ||||
| 0.02 | 19.0-23.0 | 1.0-2.0 | 2.0 | 4.0-5.0 | 23.0-28.0 | 0.045 | 0.035 | 1.0 |
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller,Other
Year Established:
2007
Total Annual:
50M-70M
Employee Number:
50~850
Ecer Certification：
Verified Supplier
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou... Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
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