S31803 Stainless Steel Round Bar, Duplex Series With Polished Surface & High Toughness, Corrosion Resistant Stainless Steel Rod

ASTM A479 Stainless Steel Bars: Full-Range Industrial Solution for Diverse Applications

We specialize in manufacturing ASTM A479-compliant stainless steel bars that cover all grades you need—from austenitic to super duplex, heat-resistant to biocompatible. Each bar is engineered to meet strict industrial standards, with customizable forms and processing to match your exact workflow requirements.

1. Product Overview: Grades & Core Advantages

Our portfolio fully covers the stainless steel grades you specified, categorized by performance to simplify your selection:

All grades comply with ASTM A479’s chemical and mechanical requirements—e.g., minimum tensile strength of 515 MPa for 316L, 1000℃ continuous service temp for S310S, and PREN (Pitting Resistance Equivalent Number) ≥40 for S32654.

2. Application-by-Industry: Tailored Performance

We’ve aligned each grade with its optimal industrial scenario, based on the use cases in your titles:

Chemical & Petrochemical

? Grades: N08020/Alloy20, S316L, S32615, S31254

? Performance: Resist concentrated sulfuric acid (98%), chlorine gas, and H?S corrosion (critical for oil wells). For example, Alloy20’s 30% Ni content prevents acid-induced stress cracking, while S32615 (super duplex) has a PREN ≥45 for chloride environments.

? Forms/Processing: Hollow bars for reactor tubes, solid round bars for valve stems, with CNC drilling and sandblasting finish.

Marine & Offshore

? Grades: N08367, S32654, S31803/2205, S32750/2507

? Performance: Seawater/brine resistance (no pitting after 1000-hour salt spray test). N08367’s 24% Cr + 6% Mo withstands marine pile corrosion; 2507 (super duplex) offers 2x the strength of 316L for subsea valves.

? Forms/Processing: Hexagonal bars for platform structures, threaded bars for subsea fittings, precision cutting-to-length (tolerance ±0.1mm).

High-Temperature (1000-1200℃)

? Grades: N08800/800, N08810/800H, S309S, S310S, S321H

? Performance: Creep resistance (no deformation at 800℃ for 10,000 hours). S310S’s 25% Cr + 20% Ni resists carburization in refractory ovens; 800H’s controlled carbon content (0.05-0.10%) ensures stability in furnace liners.

? Forms/Processing: Rectangular bars for kiln linings, thick-walled bars for heater tubes, forging processing to enhance high-temp strength.

Food, Pharma & Medical

? Grades: N08904/904L, S304L, S316L, S21800

? Performance: Food-grade (FDA 21 CFR 177.2600 compliant) and biocompatible. 904L’s low carbon (<0.02%) avoids intergranular corrosion in wine vats; S21800 (precipitation hardening) is non-toxic for surgical scalpel blanks (hardness HRC 40-45).

? Forms/Processing: Mirror-polished square bars (Ra ≤0.8μm) for mixers, thin bars for dental instruments, stamping for tableware blanks.

Aerospace & Power

? Grades: S20910/XM-19, S21800, S321, S347H

? Performance: High tensile strength (XM-19: ≥1100 MPa) and radiation resistance (316LN for nuclear pipes). S321’s titanium stabilization prevents sensitization in jet engine exhausts; S347H’s niobium content resists creep in boiler headers.

? Forms/Processing: Small-diameter threaded bars for aerospace fasteners, stepped bars for turbine parts, precision milling (tolerance ±0.05mm).

3. Form & Processing: Fully Customizable

We offer flexible forms and processing to match your end-product design—no need for secondary machining:

? Bar Forms:

? Solid: Round (3-300mm OD), hexagonal (6-80mm across flats), square (5-100mm), rectangular (10×20 to 50×100mm)

? Hollow: Seamless (10-200mm OD, 1-20mm wall thickness)

? Precision: Cold-drawn bars (diameter tolerance H9) for medical/aerospace use

? Surface Finish:

? Industrial: Black oxide, sandblasted (Ra 12.5μm)

? Food/Pharma: Mirror polish (Ra ≤0.2μm), brush finish (Ra 1.6μm)

? Processing Services:

? Cutting: CNC cutting-to-length (max 6m, tolerance ±0.5mm)

? Machining: Drilling, milling, turning, threading (ISO metric/UNC threads)

? Heat Treatment: Solution annealing (for austenitic grades), aging (for precipitation hardening grades)

4. Quality Assurance: Traceable & Compliant

Every batch of ASTM A479 stainless steel bars undergoes strict quality control to ensure reliability:

? Testing Protocols:

? Chemical Analysis: ICP-OES for Ni, Mo, Cr content (accuracy ±0.01%)

? Mechanical Testing: Tensile strength, yield strength, elongation (per ASTM A370)

? Corrosion Testing: Salt spray (ASTM B117), pitting resistance (ASTM G48)

? Dimensional Inspection: Laser diameter measurement, straightness test (<1mm/m)

? Certifications:

? Material Traceability: MTC (Mill Test Certificate) per EN 10204 3.1

? Compliance: FDA (for food-grade), ISO 9001, ASME BPVC (for pressure vessels)

? Production Control: Raw material sourced from certified mills (e.g., Outokumpu, Aperam), in-line defect detection (eddy current testing for hollow bars).

5. Why Choose Us?

? One-Stop Supply: Cover all your required grades—no need to source from multiple vendors.

? Technical Support: Our metallurgists help match grades to your application (e.g., recommend 2507 over 316L for subsea use to cut 30% maintenance cost).

? Fast Lead Time: 7-15 days for standard sizes (304L, 316L); 20-30 days for custom grades/processing.

? Flexible MOQ: 10kg for small-batch trials, bulk discounts for orders over 1000kg.

Contact us today with your drawing or grade requirement—we’ll provide a free quote and technical datasheet within 24 hours. Your reliable ASTM A479 stainless steel bar partner for industrial success.