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Home / Products / Alloy Steel Seamless Pipes / JIS G3445 STKM 11A Low Carbon Weldable Carbon Steel Tube for Machine Structural Purposes
quality JIS G3445 STKM 11A Low Carbon Weldable Carbon Steel Tube for Machine Structural Purposes factory
quality JIS G3445 STKM 11A Low Carbon Weldable Carbon Steel Tube for Machine Structural Purposes factory
quality JIS G3445 STKM 11A Low Carbon Weldable Carbon Steel Tube for Machine Structural Purposes factory

JIS G3445 STKM 11A Low Carbon Weldable Carbon Steel Tube for Machine Structural Purposes

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seamless alloy steel tube

alloy steel seamless tubes

alloy steel pipe
Product Summary
JIS G3445 STKM 11A carbon steel tubes for machine structural purposes. Low-carbon, weldable, cold-formable steel with good weldability and cold formability for automotive parts, mechanical components, and general machinery.

Product Details

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JIS G3445 STKM 11A Carbon Steel Tube

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Low Carbon Seamless Steel Tube

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Weldable Structural Steel Tube
Product Description
JIS G3445 STKM 11A Carbon Steel Tubes
Product Overview

JIS G3445 STKM 11A is a Japanese standard grade for carbon steel tubes used primarily for machine structural purposes, including automotive parts, mechanical components, and general machinery applications. This low-carbon, weldable, and cold-formable steel is conceptually comparable to mild steels like SAE 1010-1012.

Typical Chemical Composition
Element Composition Range
Carbon (C) max. 0.12-0.15%
Manganese (Mn) max. 0.35-0.50%
Phosphorus (P) max. 0.040%
Sulfur (S) max. 0.040%
Silicon (Si) typically max. 0.30%

Other alloying elements (Cr, Ni, Mo, V, etc.) are typically not intentionally added, with only residual amounts present.

Key Material Properties
  • Excellent weldability (no special preheating required for typical thin-wall tube applications)
  • Superior cold formability (suitable for bending, flaring, swaging without cracking)
  • Adequate strength balanced with formability (general-purpose structural steel)
  • Optimized for drawing, bending, and welding operations
Important Considerations

Precision Requirements: For absolute precision, consult the latest official JIS G3445 standard or the mill's Material Test Report (MTR). Some mills may use slightly different maximum Mn or Si levels while still conforming to JIS specifications.

Product Form: JIS G3445 specifically covers steel tubes (seamless, electric-resistance welded), not plate or bar products. For different product forms, cross-reference with structural plate standards like JIS G3101 SS400 or similar low-carbon grades.

Mechanical Properties Focus: In design and quality control, mechanical properties (tensile strength, yield strength, elongation, flattening, flaring) are typically more critical for STKM 11A tubes than minor composition variations, as long as chemistry remains within low-carbon mild steel parameters.

Material Substitution Guidance

When selecting substitute materials, look for low-carbon mild steel with:

  • Carbon content ≤ 0.12-0.15%
  • Low phosphorus and sulfur content
  • Similar mechanical properties (tensile strength approximately 270-410 MPa)

Common practical equivalents include EN S185-S235 or AISI 1010/1012 grades, depending on specific application requirements.

For precise material selection and alternative grade recommendations, please provide details about your specific application, including part type, forming operations, and material thickness requirements.

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