Womic Stainless Steel Co., Ltd
904L stainless steel pipe is ahigh-nickel, high-chromium austenitic stainless steelspecifically developed for environments involving strong acids and aggressive chemical media.
Compared with conventional stainless steels such as 316L, 904L stainless steel pipe offers much better resistance tosulfuric acid corrosion, phosphoric acid corrosion, and stress corrosion cracking.
Because of its unique chemical composition, 904L stainless steel pipe is widely used in industries such aschemical processing, fertilizer production, petrochemical plants, pharmaceutical manufacturing, and flue gas desulfurization systems.
The alloy also provides excellent resistance to chloride environments, making it suitable for certain marine and offshore applications.
At Womic Steel, 904L stainless steel pipes are manufactured using advanced production processes to ensure reliable performance in highly corrosive industrial environments.
The corrosion resistance of 904L stainless steel pipe is primarily determined by its high nickel and molybdenum content, combined with copper additions that improve resistance to acidic environments.
Typical chemical composition includes:
|
Element |
Content (%) |
|
Carbon (C) |
≤0.02 |
|
Chromium (Cr) |
19.0 – 23.0 |
|
Nickel (Ni) |
23.0 – 28.0 |
|
Molybdenum (Mo) |
4.0 – 5.0 |
|
Copper (Cu) |
1.0 – 2.0 |
|
Manganese (Mn) |
≤2.0 |
|
Silicon (Si) |
≤1.0 |
The high nickel content enhances resistance to stress corrosion cracking, while molybdenum improves pitting resistance.
Copper plays a particularly important role in improving resistance tosulfuric acid corrosion, which makes 904L stainless steel pipe highly suitable for chemical industry applications.
904L stainless steel pipe combines excellent corrosion resistance with good mechanical strength and ductility.
Typical mechanical properties include:
|
Property |
Value |
|
Tensile Strength |
≥490 MPa |
|
Yield Strength |
≥220 MPa |
|
Elongation |
≥35% |
|
Hardness |
≤90 HRB |
The material offers excellent toughness and weldability, allowing it to be fabricated into complex piping systems and industrial equipment.
Manufacturing 904L stainless steel pipes requires strict control of alloy composition and heat treatment procedures.
At Womic Steel, high-quality alloy billets are used as the starting material. These billets are heated and pierced to form hollow pipe shells through rotary piercing mills.
The shells are then processed through hot rolling or cold drawing equipment to achieve precise pipe dimensions and smooth surface finishes.
After forming, the pipes undergosolution annealing heat treatmentto dissolve carbide precipitates and restore the austenitic microstructure.
Surface treatments such as pickling and passivation are then applied to improve corrosion resistance and ensure a clean surface condition.
To guarantee the reliability of 904L stainless steel pipes, strict quality inspection procedures are applied during production.
Chemical analysis verifies the precise alloy composition. Mechanical testing ensures compliance with strength and ductility requirements.
Non-destructive testing methods such as ultrasonic inspection and eddy current testing are used to detect internal or surface defects.
Hydrostatic testing confirms the pressure resistance of the pipes, while dimensional inspections verify compliance with engineering specifications.
These quality control procedures ensure that 904L stainless steel pipes meet international standards such as ASTM A312 and EN 10216-5.
Because of its excellent resistance to acidic environments, 904L stainless steel pipe is widely used in chemical processing systems.
Typical applications includesulfuric acid storage tanks, phosphoric acid pipelines, fertilizer production plants, and chemical reactors.
The alloy is also used inpetrochemical processing facilities, flue gas desulfurization systems, and pharmaceutical manufacturing plants.
In addition, 904L stainless steel pipe may be used in marine environments where strong corrosion resistance is required.
As an experienced manufacturer of stainless steel piping products, Womic Steel provides high-quality corrosion-resistant pipes for global industrial markets.
The company offers a full range of stainless steel pipe grades including304, 316L, 316Ti, 904L, duplex stainless steel, and super austenitic alloys such as S31254.
Through advanced manufacturing technology, strict quality control, and efficient international logistics services, Womic Steel ensures reliable supply for major engineering projects worldwide.
Customized services. Rapid production. Global reach. We ensure your specific needs are fulfilled with precision and top-tier quality.
Website: www.womicstainless.com
Email:info@womicstainless.com
Tel/WhatsApp/WeChat:Victor: +86-15575100681 or Jack: +86-18390957568
