904L Stainless Steel Pipe Manufacturer in China
- UNS N08904
- EN X1NiCrMoCu25-20-5
- DIN / W.Nr. 1.4539
- JIS SUS 890L
- AFNOR Z2 NCDU 25-20
- ASTM A312 / ASME SA312
- ASTM A213
- ASTM B677
- EN 10216-5
- EN 10217-7
Chemical Composition of 904L Stainless Steel Pipe
| Ni | Cr | Mo | Cu | Mn | Si | C | P | S | Fe |
|---|---|---|---|---|---|---|---|---|---|
| 23.00% – 28.00% | 19.00% – 23.00% | 4.00% – 5.00% | 1.00% – 2.00% | ≤ 2.0% | ≤ 1.00% | ≤ 0.020% | ≤ 0.045% | ≤ 0.035% | Balance |
Key Alloying Elements
High nickel and chromium content not only stabilizes the austenitic microstructure but also provides the pipe with a highly resistant foundation against various organic and inorganic acids. It effectively prevents SCC.
Significantly enhances the material’s resistance to pitting and crevice corrosion in marine environments or high-concentration chloride solutions.
The addition of copper greatly enhances the material’s corrosion resistance in reducing environments,particularly in dilute sulfuric acid,as well as phosphoric and acetic acids.
The extremely low carbon content prevents the precipitation of chromium carbides at grain boundaries during welding or heat treatment,thereby completely eliminating the risk of intergranular corrosion.
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Mechanical Properties of 904L Stainless Steel Pipe
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| ≥ 490 MPa (71 ksi) | ≥ 220 MPa (32 ksi) | ≥ 35% | ≤ 90 HRB (180 HBW) |
Key Mechanical Properties
As a super austenitic stainless steel,904L offers an elongation of over 40%.This means that even when subjected to external impacts,severe bending, or cold working,the piping maintains an extremely high margin of safety against fracture.
904L does not undergo a brittle transition even at extremely low temperatures.This makes it ideal for specialized industrial piping systems involving cryogenic media.
Although 904L has slightly higher strength than standard 316L,it maintains moderate hardness.The piping is easy to cold bend,flare,and machine during actual installation.
Heat Treatment of 904L Stainless Steel Pipe
Solution Annealing
Stress Relieving
It is strictly prohibited to hold or cool 904L slowly in the 450°C – 850°C range,as this is the temperature range where brittle phases are prone to precipitation.
Post-Weld Heat Treatment
Pickling & Passivation
Our Capabilities Regarding 904L Stainless Steel Pipe
Comprehensive Manufacturing And Supply Capabilities
Seamless Pipe
- Specification Range:
1/2″ – 24″
SCH10S, SCH20, SCH40S/STD, SCH80S/XS, SCH30, SCH60, SCH80, SCH100, SCH120, SCH160, XXS - Process Advantages:
Utilizing multi-pass cold drawing/cold rolling technology ensures exceptional uniformity in wall thickness and excellent inner surface finish.
Welded Pipe
- Specification Range:
1/2″ – 104″
SCH5S~80S/XS - Process Advantages:
We utilize fully automated TIG or plasma welding,combined with in-line solution treatment of the weld,to ensure that the grain size of the weld matches that of the base material exactly.
We strictly comply with international standards such as ASTM A312, ASTM A213, ASTM A269, ASME SA312, and EN 10216-5.
Advanced Heat Treatment and Surface Control
Equipped with advanced continuous atmosphere furnaces,the material is heated to 1100°C–1150°C and then rapidly quenched in water within seconds,thoroughly preventing the precipitation of σ-brittle phases and fully restoring the material’s resistance to acid and pitting corrosion.
We operate a fully automated pickling line that performs rigorous nitric acid-hydrofluoric acid cleaning after heat treatment,forming a dense,chromium- and molybdenum-rich passivation film on the pipe surface.
We offer bright annealed surfaces,mechanical polishing,and electropolished pipes for the pharmaceutical and semiconductor industries.
Advanced Customization And Secondary Processing Capabilities
Stringent Quality Assurance And 100% Inspection System
100% eddy current testing (ET) and ultrasonic testing (UT) are performed;welded pipes undergo additional 100% radiographic testing (RT) as well as air tightness and hydrostatic pressure tests.
100% material inspection is conducted using original imported handheld and benchtop PMI (spectrometers);Intergranular corrosion testing (ASTM A262 Practice E) and metallographic examination are performed on every batch.
We fully cooperate with third-party organizations such as SGS, TÜV, BV, and DNV for factory supervision and pre-shipment sampling inspections,and provide original Material Test Certificates (MTCs) compliant with EN 10204 3.1 or 3.2.
Applications of 904L Stainless Steel Pipe
- Phosphoric Acid & Fertilizer Industry
- Marine Engineering & Subsea Manifolds
- Desalination & Reverse Osmosis
- Petroleum Refining & Hydrocracking
- Sulfuric Acid Production
- Acetic Acid & Fine Chemical Processing
- Nuclear & Conventional Power Generation
- Flue Gas Desulfurization
- Pulp and Paper Bleaching
- Pharmaceutical Manufacturing
FAQs About 904L Stainless Steel Pipe
904L contains higher levels of nickel and molybdenum,with the addition of copper.While 316L stainless steel pipes are highly susceptible to pitting and general corrosion when exposed to seawater and dilute sulfuric acid,904L exhibits exceptional corrosion resistance in warm,concentrated sulfuric acid,phosphoric acid,and marine environments.
The material cost of 904L stainless steel pipe is typically two to three times that of 316L.Furthermore,the high nickel content of 904L results in poor thermal conductivity and a high coefficient of thermal expansion.Stricter process control is required during machining and welding;otherwise,hot cracking is likely to occur.It is used exclusively in certain extreme corrosion environments.
No.904L is an austenitic stainless steel,and its internal microstructure does not undergo phase transformation during heating and cooling.The sole purpose of heat treating 904L piping is to relieve cold-working stresses and dissolve harmful precipitates,thereby fully restoring its optimal corrosion resistance.
Contact Us
- RM901 No.22 Tangjiaqiao Road Wenzhou China
- +86 577 8551 1171
- [email protected]
- https://www.kaysuns.com/
