904L Stainless Steel Round Bar | The Pinnacle of Acid and Chloride Resistance

✓ Sulfuric Acid Dominance: 0.001mm/year corrosion rate in 98% H₂SO₄ at 40°C (104°F) – 10x lifespan vs 316L.

✓ Seawater Immunity: PREN ≥36, validated by 15,000-hour ASTM G48 Method D crevice corrosion testing.

✓ Cryogenic Toughness: Maintains ductility from **-196°C to 400°C (-321°F to 752°F)** for LNG and cryogenic systems.

✓ Fabrication Precision: Low carbon content (0.02% max) prevents hot cracking during welding (AWS A5.9 ER385 filler recommended).

904L Stainless Steel Round Bar (UNS N08904)

Engineered to conquer the most aggressive chemical and marine environments, 904L super austenitic stainless steel round bars combine high molybdenum (4.5%), copper (1.5%), and nickel (24%) content to deliver unrivaled resistance to sulfuric acid, phosphoric acid, and chloride-induced corrosion. Certified to ASTM A276/A479 and NACE MR0175/ISO 15156, this premium alloy outperforms conventional stainless steels in chemical processing, pharmaceutical, and offshore applications where failure is not an option.

Diameter Range: 5mm–300mm (hot-rolled ±0.5%; cold-drawn ±0.03mm)
Length: 1m–6m standard (cut-to-length precision ±0.5mm)
Surface Finishes: Pickled & Passivated, Polished (Ra ≤0.6μm), Electropolished (Ra ≤0.2μm)
Mechanical Properties: Yield Strength ≥220 MPa | Tensile Strength ≥490 MPa | Elongation ≥45% | Hardness ≤230 HBW

Parameter Category	Value/Description
Material Standard	ASTM A276 / ASTM A479, EN 10088-3, UNS N08904
Chemical Composition (%)	C ≤0.02, Cr 19–23, Ni 23–28, Mo 4–5, Cu 1–2, Mn ≤2.0, Si ≤1.0, P ≤0.045, S ≤0.035
Tensile Strength (MPa)	≥490 (Solution Annealed)
Yield Strength (MPa)	≥216 (Solution Annealed)
Elongation (%)	≥35 (in 50mm gauge length)
Hardness	Brinell (HBW): ≤220; Rockwell (HRB): ≤95 (Annealed)
Density (g/cm³)	8.00
Melting Range (°C)	1300–1390
Thermal Conductivity (W/m·K)	12.5 (at 20°C)
Thermal Expansion (10⁻⁶/°C)	15.9 (20–100°C)
Electrical Resistivity (Ω·m)	0.90 × 10⁻⁶ (at 20°C)
Elastic Modulus (GPa)	195
Magnetic Permeability	Non-magnetic (austenitic structure)
Corrosion Resistance	Exceptional resistance to sulfuric acid, phosphoric acid, chlorides, and organic acids; PREN ≥36. Resists stress corrosion cracking (SCC).
Heat Treatment	Solution Annealing: 1100–1170°C followed by rapid cooling (water or air quench).
Surface Finishes	Hot-rolled (black), cold-drawn (bright), polished, pickled & passivated.
Standard Dimensions	Diameter: 5mm–300mm; Length: 3000–6000mm (custom lengths available).
Key Applications	Chemical reactors, sulfuric acid tanks, seawater heat exchangers, oil & gas pipelines, pharmaceutical equipment, flue gas desulfurization (FGD) systems.

904L Stainless Steel Round Bar Applications

Industry	Critical Components	904L Round Bar Advantage
Chemical Processing	Sulfuric acid concentrators, pickling tanks	0.001mm/year corrosion rate in 98% H₂SO₄ at 40°C.
Pharmaceutical	API reactors, solvent recovery systems	Complies with FDA CFR 211.65 and EU GMP Annex 1.
Marine Engineering	Seawater heat exchangers, scrubber units	Resists MIC (Microbiologically Influenced Corrosion) in stagnant seawater.
Nuclear Fuel	UF₆ handling equipment, reprocessing tools	Withstands hydrogen fluoride (HF) up to 200°C (392°F).

904L Stainless Steel Round Bar Product Packaging

904L Stainless Steel Round Bar are precision-engineered for superior corrosion resistance and mechanical strength, meeting ASTM A276 and ISO 3506 standards. To ensure optimal performance from factory to your facility, we implement rigorous packaging protocols and logistics safeguards.

Why Choose Us

Where Precision Meets Partnership，25 years of focus on metal material science，Not only a supplier, but also your engineering consultant，Fast and zero compromise，Sustainable trust cycle。