起源の場所:
Zhijiang/China
ブランド名:
TORICH
証明:
ISO9001 ISO 14001 TS16949
モデル番号:
ステンレス鋼の継ぎ目が無い管
904L (UNS N08904 / EN 1.4539) is a super austenitic, low-carbon stainless steel alloyed with high Nickel (Ni) and Molybdenum (Mo) plus Copper (Cu). This chemistry is designed for aggressive chemical service, especially where reducing acids (e.g., sulfuric acid) and chloride-containing media are concerns.
Product: Seamless tubing (cold-worked or hot-finished; solution annealed upon request)
Form: Straight lengths / cut-to-length / U-bend (if required)
Surface: Pickled & passivated, bright annealed, polished (as required)
Inspection & Documentation: PMI, dimensional inspection, hydro/NDT options, MTC/EN 10204 (upon request)
Excellent resistance to reducing acids (notably sulfuric acid environments)
Strong resistance to localized corrosion (pitting/crevice) and improved chloride stress corrosion cracking resistance versus standard austenitic grades
Good weldability and formability typical of austenitic stainless steels (with proper procedure control)
Seamless construction supports higher reliability for pressure/thermal cycling and tighter cleanliness control in process lines
“Will 904L survive our acid/chloride chemistry without premature pitting or SCC?”
Solution: 904L is engineered for harsh corrosion service—its alloying balance (Ni–Mo–Cu) is specifically used to improve performance in reducing acids and enhance resistance to chloride attack (pitting/crevice) and SCC compared with conventional austenitic grades.
“Can you guarantee material traceability and incoming quality for critical chemical lines?”
Solution: We support full traceability (heat number control), optional PMI, and inspection packages aligned to project QA plans—helping you reduce incoming risk for high-consequence service.
“Do you control surface condition/cleanliness for corrosion and contamination-sensitive processes?”
Solution: Seamless tubing can be supplied with controlled surface finishes (pickled/passivated, bright annealed, polished). Clean surfaces help preserve the passive layer and improve reliability in chemical service where contamination and crevice sites are unacceptable.
| Grade | Standard / Common ID | C | Si | Mn | P | S | Cr | Ni | Mo | Cu | N |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 904L | UNS N08904 / EN 1.4539 | ≤0.020 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.035 | 19.0–23.0 | 23.0–28.0 | 4.0–5.0 | 1.0–2.0 | ≤0.10 |
| 316L | EN 1.4404 / UNS S31603 | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.015* | 16.5–18.5 | 10.0–13.0 | 2.00–2.50 | — | ≤0.10 |
| 317L | UNS S31703 / EN 1.4438 | ≤0.030 | ≤0.75 | ≤2.00 | ≤0.045 | ≤0.030 | 18.0–20.0 | 11.0–15.0 | 3.0–4.0 | — | ≤0.10 |
| 321 | UNS S32100 | ≤0.08 | ≤0.75 | ≤2.00 | ≤0.045 | ≤0.030 | 17.0–19.0 | 9.0–12.0 | — | — | ≤0.10 |
| 310S | UNS S31008 | ≤0.08 | ≤1.50 | ≤2.00 | ≤0.045 | ≤0.030 | 24.0–26.0 | 19.0–22.0 | — | — | — |
| Grade | Tensile Strength Rm (MPa) | Yield Strength Rp0.2 (MPa) | Elongation A (%) | Hardness (typical limit) |
|---|---|---|---|---|
| 904L | ≥490 | ≥220 | ≥35 | HRB ≤90 |
| 316L (1.4404) | 490–690 (tubes) | ≥190 (tubes) | ≥40 (tubes) | — |
| 317L | ≥515 | ≥205 | ≥40 | HRB ≤95 |
| 321 | ≥515 | ≥205 | ≥40 | HRB ≤95 |
| 310S | ≥515 | ≥205 | ≥40 | HRB ≤95 |
ASTM:
ASTM B677 — Seamless pipe & tube for UNS N08904 (904L) general corrosive service
(Project-dependent) common stainless tube/pipe specs may also be requested by EPCs (confirm purchase spec)
EN:
EN 10216-5 — Seamless stainless steel tubes for pressure purposes (common route for 1.4539 supply)
GOST (typical):
GOST 9941 — Seamless corrosion-resistant steel tubes (project-dependent)
JIS (typical):
JIS G3459 / JIS G3463 — Stainless steel pipes / boiler & heat exchanger tubes (project-dependent)
GB (typical):
GB/T 14976 — Stainless steel seamless pipes for fluid transport
GB/T 13296 — Stainless steel seamless pipes for boilers & heat exchangers
Primary field: Chemical & process industries (corrosion-critical piping and tubing)
Where it’s used (examples):
Acid service lines: sulfuric/phosphoric/acetic acid handling, transfer and circulation lines
Heat transfer equipment: heat exchangers, condensers, coolers in aggressive media
Gas cleaning & scrubbing: components in gas scrubbing systems and wet process areas
Seawater/chloride environments: cooling circuits and chloride-exposed process utilities
A: manufacturer,also can do trading.
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,
it is according to quantity.
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
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