STKM11A is a carbon steel tube classified under the Japanese Industrial Standard (JIS) and is commonly used for general structural purposes. Its chemical composition plays a crucial role in determining the properties of the material. The key elements include:
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 of Grade 11A
- Range of Products of MT1010
- Delivery Conditions 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 Techniques, Refer JIS G3445 STKM11A Steel Equivalent
STKM11A tubes are produced using an uninterrupted process and can be manufactured via hot or cold finishing techniques. Hot finishing refers to processes carried out at recrystallization temperatures, while cold finishing involves operations performed at room temperature. For pipes with diameters greater than 38mm, hot finishing is typically used, whereas smaller diameter pipes often utilize cold finishing methods.
Hot finishing involves processing at elevated temperatures, which enhances ductility and reduces internal stresses within the material. Conversely, cold finishing refines the structure of the tube further by reheating it, improving both dimensional accuracy and surface quality.
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
Despite its relatively high density, STKM11A offers an excellent balance between strength and weight. This characteristic provides the material with robustness and durability, making it ideal for high-stress applications. Furthermore, its favorable strength-to-weight ratio ensures structural integrity even under demanding conditions, particularly at elevated temperatures.
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
Due to its high hardness and excellent strength, STKM11A is extensively utilized in the automotive sector. These properties result from its specific chemical composition and the manufacturing processes it undergoes. This combination makes it suitable for automotive applications requiring resistance against pressure and impact forces.
For long-term durability and reliability, this material is often chosen by manufacturers.
STKM11A Hardness
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
The thermal conductivity of STKM11A is moderate, making it effective for heat transfer applications. This property enables its use in automotive exhaust systems and heat exchangers when operated within specified temperature ranges.
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 of STKM11A primarily depend on its chemical composition and microstructure. It operates effectively in low to moderate temperature ranges, so adhering to the recommended temperature limits is essential to prevent degradation or failure of the material.
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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