Product Introduction

904L is a well-known super austenitic stainless steel with copper addition to enhance resistance to reducing acids. It is the preferred grade for dilute sulfuric acid and phosphoric acid circuits. Its chloride pitting performance is lower than 6Mo grades, making it ideal for reducing acid dominated conditions.

Key Advantages

• Excellent resistance to dilute sulfuric acid and phosphoric acid

• Low carbon, immune to intergranular corrosion after welding

• Good resistance to chloride stress corrosion cracking

• Fully austenitic, non-magnetic, good fabricability

• Cost competitive for reducing acid process

Typical Applications

Fertilizer plant acid piping, dilute sulphuric acid heat exchanger tubes, phosphoric acid auxiliary lines, acid wastewater treatment piping, chemical process straight tubing.

Specification Table

表格







Item

Parameter

Material Grade

904L / UNS N08904 / 1.4539

Executive Standard

ASTM A312 / ASTM B673

Outer Diameter

6 mm ~ 219 mm, custom OD available

Wall Thickness

1.0 mm ~ 12.7 mm, customized wall thickness

Length

Fixed straight length: 3m / 4m / 5m / 6m, custom length available

Working Pressure

Subject to OD & wall thickness calculation

Working Temperature

-200℃ ~ 400℃

Form

Straight tube (non-coiled)

Delivery & Surface Condition

Cold drawn + solution annealed, pickled & passivated. Deburred ends, plastic protection caps.

Certification & Compliance

Full heat traceability, 3.1 /3.2 MTC available. Eddy current, hydrostatic test can be arranged.

Customization

Custom OD, wall thickness, fixed length, end finishing and export packing are supported.