STKM11A is a type of carbon steel tube governed by the Japanese Industrial Standard (JIS), commonly used for structural and mechanical applications. Its chemical composition plays a vital role in determining its performance and suitability for various industrial uses.
Table of contents
- STKM11A Chemical Composition
- JIS G3445 Grade STKM11A Mechanical Properties
- STKM11A Equivalent Materials
- Flattening and Bending of ASTM A519 MT1010
- Physical Properties of Grade STKM11A
- Tolerances of JIS G3445 STKM11A Tube
- Chemical Compatibility of STKM11A Material
- ASTM Standards for Grade 11A
- Range of Products of MT1010
- Delivery Condition of DIN 1.0034
- STKM11A Hardness
- Smelting Temperature of ASTM A519 MT1010
- JIS G3445 Gr STKM11A Thermal Properties
- Cold Finishing Temperature of Grade 11A
- Creep Strength of MT1010 Material
- Working Temperature Range of STKM 11A
- EN 1.0034 Testing Methods
- Heat Treatment Techniques for JIS G3445 STKM11A
- Inspection Report for STKM11A Carbon Steel Tubes
STKM11A Chemical Composition
JIS G3445 Grade STKM11A Mechanical Properties
| Elongation A (%) |
Yield Strength Rp0.2 (MPa) |
Tensile Strength Rm (MPa) |
Impact KV (J) |
Reduction in cross section on fracture Z (%) |
|---|---|---|---|---|
| 13 | 518 (≥) | 424 (≥) | 34 | 23 |
Grade 11A manufactured using hot or cold finishing techniques, refer to JIS G3445 STKM11A Steel Equivalent
STKM11A tubes are produced through a continuous process and can be either hot-finished or cold-finished. Hot finishing involves rolling at high temperatures, while cold finishing is done at room temperature. The choice between the two depends on the pipe diameter, with larger diameters typically using hot finishing and smaller ones using cold finishing.
Hot finishing allows for better formability and is often preferred for larger pipes, while cold finishing provides improved dimensional accuracy and surface finish. Both methods have their own advantages depending on the application requirements.
STKM11A Equivalent Material
| NUMBER | GRADE | ASTM NUMBER | JIS | MECHANICAL | |
|---|---|---|---|---|---|
| D 3517 | Grade 11 A | STKM 11 A | A513 | G-3445 | MT1010 |
Flattening and Bending of ASTM A519 MT1010
| Flattening Test | Bending Test | |
|---|---|---|
| Distance between that parts (D=OD) |
Bend Angle |
Inside Radius (D=OD) |
| 1/2D | 180° | 4D |
STKM11A grade contains 0.40% silicon, view physical properties of STKM11A steel pipe
Its high density ensures a balance between strength and weight, making it ideal for applications requiring durability and robustness. It performs well in high-temperature environments due to its favorable strength-to-weight ratio.
Physical Properties of Grade STKM11A
| Density kg/dm3 |
Thermal conductivity W/mK |
Temperature T °C/F |
Specific heat J / kgK |
|---|---|---|---|
| 371 (≥) | 13 | 34 | 41 |
Tolerances of JIS G3445 STKM11A Tube
| Wall Thickness (WT) | Tolerances on Wall Thickness (WT) |
|---|---|
| Under 4mm | +0.6 -0.5 |
| 4mm or over | +15% -12.5% |
| Under 3mm | ±0.3 |
| 3mm or over | ±10% |
| Under 2mm | ±0.15 |
| 2mm or over | ±8% |
Chemical Compatibility of STKM11A Material
| Media | Symbol | Compatibility |
|---|---|---|
| Acetonitrile (Methyl Cyanide) |  |
Excellent |
| Acetyl Chloride |  |
Good |
| Adipic Acid | |
Excellent |
| Alcohol: Isobutyl |  |
Good |
| Allyl Bromide | |
Not recommended |
| Amyl Acetate (Banana Oil) | |
Fair to Poor |
| Butyric Acid | |
Not recommended |
ASTM Standards of Grade 11A
| Standard | |
|---|---|
| ASTM A519 | ASTM A513 |
Range of Products of MT1010
| Products | Dimension | Processes |
|---|---|---|
| Seamless and Welded Pipes/Tubes | OD:6-219mm x WT:0.5-20.0mm | Welded, Hot extrusion, Cold Drawn |
| Plates / Sheets | 0.08-200mm(T)*W*L | Forging, cold and hot rolling |
| Round Bar | Φ8-1200mm*L | Cast, Forging, cold and hot rolling |
| Coil / Strip | 0.03-16.0x1200mm | Hot-Rolled & Cold-Rolled |
Delivery Condition of DIN 1.0034
| Designation | Symbol |
|---|---|
| Cold finished (soft) | BKW |
| Cold finished (hard) | BK |
| Cold finished and stress-relieved | BKS |
| Normalized | NBK |
| Annealed | GBK |
STKM11A material is widely used in the automobile industry, refer to hardness of STKM 11A JIS G3445 grade
Due to its high hardness, STKM11A is commonly used in automotive applications where durability, strength, and resistance to pressure and impact are essential. This makes it suitable for components like exhaust systems and structural parts.
STKM11A Hardness
| Hardness | |
|---|---|
| 77 HRB | 212 HBW |
Smelting Temperature of ASTM A519 MT1010
| Smelting temperature | 1821°C – 1823°C |
|---|
DIN 1.0034 melting range is 1480 – 1526 °C, check ASTM A519 MT1010 material thermal properties
Its moderate thermal conductivity makes it efficient for heat transfer, which is useful in applications such as automotive exhaust systems and heat exchangers.
JIS G3445 Gr STKM11A Thermal Properties
| Temperature (°C) | 14 | 314 | 937 |
|---|---|---|---|
| Modulus of elasticity (GPa) | – | 281 | – |
| Mean coefficient of thermal expansion ×10-6/(°C) | – | – | 13 |
| Thermal conductivity (W/m·°C) | – | 31.3 | 42.2 |
| Specific thermal capacity (J/kg·°C) | – | 111 | – |
| Specific electrical resistivity (Ω mm²/m) | 0.33 | – | – |
| Deity (kg/dm³) | – | – | 443 |
| Poisson’s coefficient, ν | – | – | 124 |
Cold Finishing Temperature of Grade 11A
| Temperature | 1200°F [650°C] |
|---|
View creep strength and temperature range of STKM11A carbon steel material
The creep strength and rupture properties depend on its chemical composition and microstructure. It works well in low to moderate temperature ranges, so it's important to use it within the recommended limits to avoid damage or degradation.
Creep Strength of MT1010 Material
| Creep strain (10000h) (Rp1,0) N/mm2 |
Creep rupture (10000h) (Rp1,0) N/mm2 |
|---|---|
| 141 | 922 |
STKM 11A Grade Working Temperature Range
| Temperature range | 425 °C |
|---|
EN 1.0034 Testing Methods
Ultrasonic Inspection
Eddy Current Inspection
Magnetic Particle Inspection
Spectro-Chemical Analysis
Electromagnetic Inspection
STKM 11A JIS G3445 Heat Treatment Techniques
| Annealing | Quenching | Tempering | Normalizing | Q & T |
|---|---|---|---|---|
| √ | √ | √ | √ | √ |
STKM11A Carbon Steel Tubes Inspection Report
| OD. (mm) |
Tolerance (mm) |
ID. (mm) |
Tolerance (mm) |
Length (mm) |
Tolerance (mm) |
Straightness (mm) |
|---|---|---|---|---|---|---|
| 4 | ±0.05 | 1.5 | -0/+20 | 3000 | ±0.05 | 1:1000 |
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