STKM 11A Carbon Steel Seamless Tubes – Precision Pipes for Machine Structural Applications
Material Overview
The STKM 11A, SAE 1010, and ST37 carbon steel seamless tubes are low-carbon steels designed for mechanical and structural applications requiring precision and formability. Manufactured according to JIS G3445, these tubes offer excellent machinability, weldability, and dimensional accuracy, making them suitable for various industries, including automotive, machinery, and furniture manufacturing.
Specifications
Chemical Composition
The following table outlines the chemical compositions of STKM 11A, SAE 1010, and ST37:
| Steel Grade |
C (%) |
Mn (%) |
Si (%) |
P (%) |
S (%) |
| STKM 11A |
≤0.12 |
≤0.60 |
≤0.35 |
≤0.040 |
≤0.040 |
| SAE 1010 |
0.080–0.13 |
0.30–0.60 |
≤0.35 |
≤0.040 |
≤0.050 |
| ST37 |
≤0.17 |
≤1.40 |
≤0.35 |
≤0.045 |
≤0.045 |
Mechanical Properties
The mechanical properties of STKM 11A, SAE 1010, and ST37 are as follows:
| Steel Grade |
Yield Strength (MPa) |
Tensile Strength (MPa) |
Elongation (%) |
| STKM 11A |
≥205 |
410–540 |
≥35 |
| SAE 1010 |
172–315 |
310–430 |
29–45 |
| ST37 |
≥225 |
340–510 |
≥26 |
Key Features
-
Cold-Drawn Precision: Manufactured using cold-drawing techniques to achieve tight tolerances and smooth surface finishes.
-
Excellent Formability: Low carbon content enhances the ability to form and shape without compromising strength.
-
High Weldability: Suitable for welding processes, making it ideal for complex assemblies.
-
Versatile Applications: Applicable in various mechanical and structural applications requiring precision and durability.
Standards Compliance
-
JIS G3445: Carbon steel tubes for machine structural purposes.
-
ASTM A513 MT1010: Specification for electric-resistance-welded carbon steel mechanical tubing.
-
DIN 2391 St37: German standard for seamless precision steel tubes.
Applications
STKM 11A, SAE 1010, and ST37 seamless tubes are widely used in:
-
Automotive Industry: Manufacturing of chassis components, suspension parts, and structural frames.
-
Bicycle Manufacturing: Production of frames and handlebars.
-
Furniture Industry: Fabrication of tubular furniture frames.
-
Appliance Manufacturing: Construction of structural parts in household appliances.
-
General Machinery: Used in various machine parts requiring high precision and strength.
Equivalent Grades and Standards
STKM 11A is equivalent to several international steel grades, including:
-
SAE 1010: A low-carbon steel grade commonly used in the automotive industry.
-
AISI 1010: An American Iron and Steel Institute designation for low-carbon steel.
-
ASTM A513 MT1010: A specification for electric-resistance-welded carbon steel mechanical tubing.
-
DIN 2391 St37: A German standard for seamless precision steel tubes.
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