Ss 410 Seamless Tubes

SS 410 seamless tubes are martensitic stainless steel components engineered for high-stress applications requiring heat resistance, moderate corrosion tolerance, and cost-effective durability. With 11.5–13.5% chromium and a low carbon content (≤0.15%), these tubes excel in environments up to 650°C (1.202°F), such as boilers, heat exchangers, and hydraulic systems. Compliant with ASTM A213 and EN 10216-5, they offer 20–30% cost savings versus 304/316 grades while delivering superior tensile strength and fatigue resistance.

Key Advantages

High-Temperature Performance

Retains structural integrity under cyclic thermal stress (e.g., furnace parts, exhaust manifolds).

Oxidation resistance up to 800°C (1.472°F) in intermittent service.

Mechanical Robustness

Tensile strength ≥540 MPa (annealed) and ≥1.000 MPa (hardened).

Rockwell hardness adjustable from HRB 85 (annealed) to HRC 35 (quenched & tempered).

Corrosion Resistance

Resists scaling in steam, weak acids, and alkalis (pH 4.5–9.5).

Fabrication Flexibility

Compatible with TIG welding (AWS ER410 filler) and CNC machining.

Global Standards & Grades

Region	Standard	Grade	Surface Finish
USA	ASTM A213	UNS S41000	Annealed, Pickled
Europe	EN 10216-5	1.4006	Shot Blasted (Sa 2.5)
Japan	JIS G3463	SUS410	Bright Annealed (BA)

Technical Specifications

Chemical Composition (wt%)

Cr	C	Mn	Si	P	S	Fe
11.5–13.5%	≤0.15%	≤1.0%	≤1.0%	≤0.04%	≤0.03%	Balance

Mechanical Properties

Condition	Tensile Strength	Yield Strength	Elongation	Hardness
Annealed	540–750 MPa	345 MPa (min.)	≥20%	≤HRB 95
Hardened	1.000–1.350 MPa	825 MPa (min.)	≥12%	HRC 28–35

Primary Applications

Energy Sector: Superheater tubes, boiler condensers, and steam turbine components.

Automotive: Exhaust gas recirculation (EGR) systems, turbocharger housings.

Oil & Gas: Downhole tooling, valve trim, and flowline fittings.

General Engineering: Hydraulic cylinders, bearing sleeves, and fastener dies.

Fabrication Guidelines

Welding Best Practices

Preheat to 200–300°C for thickness >6 mm to avoid cracking.

Post-weld heat treatment (PWHT) at 650–760°C to restore ductility.

Heat Treatment

Harden at 980–1.050°C followed by oil/air quenching.

Temper at 540–760°C to balance hardness and toughness.

Machining

Use coated carbide tools with sulfurized cutting fluids for optimal finish.

Quality Assurance

Testing:

100% ultrasonic testing (UT) per ASTM E213.

Hydrostatic pressure tested at 2× working pressure (ASME B31.1 compliant).

Certifications:

ISO 9001:2015. PED 2014/68/EU, NACE MR0175 for sour service.

Traceability:

Full material batch records with EN 10204 3.1 certification.

FAQs

Q1: How does SS 410 compare to SS 304 in chloride environments?

A1: SS 410 offers inferior chloride resistance-avoid marine use. Opt for 316L or duplex grades for high-chloride exposure.

Q2: Can SS 410 tubes be cold-drawn?

A2: Yes-cold drawing enhances surface finish and dimensional precision (tolerance ±0.1 mm).

Q3: Maximum continuous service temperature?

A3: 650°C (1.202°F) in oxidizing atmospheres; reduce to 540°C (1.004°F) in sulfidizing conditions.

Q4: How to prevent intergranular corrosion?

A4: Post-fabrication annealing at 760°C followed by rapid cooling bypasses carbide precipitation.

Q5: Is passivation necessary for food-grade applications?

A5: Yes-citric or nitric acid passivation per ASTM A967 is mandatory for FDA-compliance.

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