STKM11A is a Japanese Industrial Standard (JIS) grade of carbon steel tubes commonly used for general structural applications. Its chemical composition plays a vital role in determining the material's performance and suitability for various industrial uses.
Table of contents
- STKM11A Chemical Composition
- JIS G3445 Grade STKM11A Mechanical Properties
- STKM11A Equivalent Material
- 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 of 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
- STKM 11A Grade Working Temperature Range
- EN 1.0034 Testing Methods
- STKM 11A JIS G3445 Heat Treatment Techniques
- STKM11A Carbon Steel Tubes Inspection Report
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 according to hot and cold finished technique, Refer JIS G3445 STKM11A Steel Equivalent
STKM11A tubes are produced using either hot or cold finishing methods. 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.
Hot finish provides better formability, while cold finish enhances surface finish and dimensional accuracy. Both techniques ensure the quality and performance of the final product.
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 gives balance between strength and weight. It gives the material robustness and durability, which make it ideal for high strength applications.
In spite of its weight, the strength-to-weight ratio is favorable, maintaining structural integrity by offering good performance in high-temperature environments.
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 widely used in automobile industry, Refer hardness of STKM 11A JIS G3445 grade
It is used in the automobile industry due to its high hardness qualities, which mainly occurred due to its chemical composition and the manufacturing process which it goes through and this combination makes it applicable for automotive applications where high hardness, excellent strength and durability is required for resisting the pressure and crash experience in automotive applications.
Hence, for durability and longevity purposes an individual chooses this material.
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
Here, the thermal conductivity is moderate which makes it efficient for heat transfer. And this property makes it applicable to be used for automotive exhaust systems and heat exchangers if it is used in the range of temperature.
JIS G3445 Gr STKM11A Thermal Properties
| Temperature (°C) | 14 | 314 | 937 |
|---|---|---|---|
| Modulus of elasticity (GPa) | – | 281 | – |
| Mean coefficient of thermal expaion ×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 mainly depend upon its chemical composition and microstructure. Here it can work in low to moderate temperature, therefore it is advisable to work according to the temperature range given as above which can save your product from getting destroyed or decomposing.
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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