Stainless Steel Rod for Piping | 304L & 317L Grades

Product Specifications

Parameter	Details
Material Grades	304L, 317L, 316L (Customizable for stainless steel welding rods 316 or threading stainless steel rod applications)
Diameter Range	Round Rods: 6–500mm; Threaded Rods: M6–M30; Welding Rods: 1.6–6.0mm (tig welding rod stainless steel)
Length	0.1–12m (Standard), Custom Lengths Available (±0.1mm Tolerance)
Hardness (HV)	150–220 HV (304L); 180–250 HV (317L); 300–400 HV (Cold-Worked Variants)
Tensile Strength	485–860 MPa (304L) ; 620–930 MPa (317L)
Surface Finish	Polished (#4–#8 Mirror), Passivated, Cold Drawn, Electroplated (Optional)
Certifications	ISO 9001, ASTM A276/A312/A358 , EN 10088, NACE MR0175 (H₂S Resistance)
Welding Compatibility	tig welding rod stainless steel (ER316L/ER317L), MIG, Laser Welding

Mechanical & Chemical Properties

Tensile Strength

The 304L grade achieves tensile strengths of 485–860 MPa, ideal for low-pressure piping systems in food processing and water treatment due to its low carbon content (≤0.03%), which minimizes carbide precipitation during welding. The 317L grade, enhanced with 3–4% molybdenum, delivers 620–930 MPa tensile strength, outperforming 316L in highly corrosive environments like chemical plants and offshore platforms. For critical joints requiring stainless steel welding rods 316, ER316L filler metals ensure weld integrity up to 860 MPa.

Bend Strength

Bend strength ranges from 60–75% of tensile strength, optimized for dynamic loads. Cold-drawn threading stainless steel rod (304L) exhibits 310–430 MPa bend resistance, suitable for seismic-resistant pipe supports. The 317L grade retains 30% higher bend resistance than 304L, making it ideal for refinery piping exposed to thermal cycling.

Identification & Marking

Stainless steel rods are labeled per global standards for traceability:

ASTM A276: Specifies chemical compositions (e.g., 317L: 18–20% Cr, 13–15% Ni, 3–4% Mo).
ISO 15510: Ensures compliance for marine and medical-grade applications.
Laser Etching: Permanent markings include grade (e.g., "317L-930MPa"), batch number, and tensile class.

Weight Calculation

Weight (kg) = Volume (m³) × Density (7,930 kg/m³ for austenitic steel).
Example for a 12mm diameter, 1m rod (304L):
π × (0.006m)² × 1m × 7,930 kg/m³ ≈ 0.89 kg.
For threading stainless steel rod (M20 threaded, 316L grade):
Weight ≈ 2.47 kg/m. Custom weights vary with alloy density and surface treatments.

Why Stainless Steel Rusts: Causes & Solutions

While stainless steel resists corrosion via chromium oxide layers (≥10.5% Cr), specific conditions trigger rust:

Chloride Exposure: Coastal saltwater or de-icing salts degrade passive layers. Use 317L rods with 3–4% Mo for marine-grade stainless steel welding rods 316 in desalination plants.
Galvanic Corrosion: Contact with carbon steel accelerates oxidation. Insulate joints using dielectric coatings or ER309L fillers from the tig welding rod stainless steel series.
Mechanical Damage: Scratches expose iron. Passivate surfaces with nitric acid post-machining to restore chromium oxide layers.
Low Oxygen Environments: Stagnant water in crevices (e.g., threaded joints) breeds crevice corrosion. Design gaps >0.5mm for oxygen flow.

Why Choose Our Stainless Steel Rods

Certified Quality: ISO 9001 and ASTM-compliant production with third-party SGS/BV inspections.
Precision Customization: Tailor threading stainless steel rod, tig welding rod stainless steel, or seamless rods to ±0.1mm tolerance.
Fast Delivery: Bulk orders shipped globally in 15–30 days via DHL/FedEx; regional stainless steel welding rods 316 inventory available for urgent projects.
Sustainability: 100% recyclable alloys; lean duplex grades reduce nickel consumption by 50%.
Technical Support: Expert guidance on welding parameters (e.g., ER317L preheat: 150–200°C) and corrosion prevention.

Stainless Steel Rod for Piping | 304L & 317L Grades