STKM11A is a type of carbon steel tube classified under the Japanese Industrial Standard (JIS), commonly used for structural applications. Its chemical composition consists of various elements, including carbon, manganese, and iron, which play crucial roles in forming the desired properties of the material.
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 manufactured using continuous processes and can be produced via either hot or cold finishing techniques.
Hot finishing refers to the process carried out at temperatures above the recrystallization point, whereas cold finishing involves processing at room temperature. Buyers or consumers who require pipes with diameters larger than 38mm often opt for hot finishing, while smaller diameters are better suited for cold finishing.
Hot finishing ensures that the final product retains high temperatures, which aids in achieving the desired structural properties. On the other hand, cold finishing involves reheating the material to enhance its structure and achieve precise dimensions and finishes.
STKM11A Equivalent Materials
| 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
With a high density, STKM11A offers a balanced strength-to-weight ratio. This attribute provides the material with robustness and durability, making it suitable for high-stress applications.
Despite its weight, the material maintains structural integrity and performs well in high-temperature environments, thanks 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 Widely Used in Automobile Industry, Refer Hardness of STKM 11A JIS G3445 Grade
STKM11A is extensively used in the automotive industry because of its high hardness and strength, which result from its chemical composition and the manufacturing processes it undergoes. These qualities make it ideal for applications requiring resistance to pressure and impact, such as automotive components.
Due to its durability and long-lasting nature, this material is preferred for automotive applications.
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
Here, the thermal conductivity is moderate, making it effective for heat transfer. This property allows it to be used in automotive exhaust systems and heat exchangers within a specific temperature range.
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 largely depend on the material's chemical composition and microstructure. STKM11A can operate effectively in low to moderate temperature ranges, so it's important to adhere to the recommended temperature limits to prevent 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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