- Grade : STKM13A
- Standards : JIS G 3445: Carbon steel tubes for machine structure
- OD : 19.05mm ~ 114.3 mm
- WT : 2.0mm ~ 14 mm
- Length : max 16000 mm
STKM 13A Mechanical Tubes for Architectural Structures and Automobile
These mechanical tubes are manufactured as per Japanese Standard JIS G 3445. STKM 13A Carbon Steel Tubing can be produced with Hot-rolled and Cold Worked process.
Table of contents
- STKM 13a Specification
- STKM13A Equivalent Material
- JIS G3445 STKM13A pipe sizes
- Dimensional Tolerances of JIS G 3445 Grade STKM 13A Tubing
- Standard length tolerances of ASTM A519 Grade 1020 Tubes
- Physical Properties of STKM13A steel grade
- ISO 683-1 C20E4 Delivery Conditions
- How to order STKM13A Tubes?
- Schedule chart of E355+sr En 10305-1 Pipe
- STKM13A Chemical Composition
- SCH 10s and 40 JIS G3445 STKM13A Pipe
- STKM 13A Grade Hardness
- STKM13A Material Tensile Strength
- JIS G3445 Grade STKM 13A Applications
- STKM13A Material Properties
STKM 13A Carbon Steel Seamless Tubes in Hot and Cold Finished
| Hot Finished Seamless Steel Tube | S-H |
| Cold Finished Seamless Steel Tube | S-C |
| ERW Steel Tube | E-G |
| Hot Finished ERW Steel Tube | E-H |
| Cold Finished ERW Steel Tube | E-C |
| Butt-welded Steel Tube | B |
| Cold Finished Butt-welded Steel Tube | B-C |
| Attribute | Details |
|---|---|
| Grade | STKM13A |
| Classification | Structural steel Carbon steel |
| Standards | JIS G 3445: Carbon steel tubes for machine structure |
| Applications | – Machinery – Automobiles – Bicycles – Furniture – Appliances – Other machine parts |
| Standard | DIN 2391 | EN 10305-1 | ASTM A519 | ISO 683-1 | GB/T 8713, GB/T 3639 |
|---|---|---|---|---|---|
| Grade | ST52 BK+S | E355+SR | Grade 1020 | C20E4 | 20# |
| NPS | ID (IN) | OD (IN) | WT (IN) |
|---|---|---|---|
| 1/8 | 0.269″ | 0.405″ | 0.068″ |
| 1/4 | 0.364″ | 0.540″ | 0.088″ |
| 3/8 | 0.493″ | 0.675″ | 0.091″ |
| 1/2 | 0.622″ | 0.840″ | 0.109″ |
| 3/4 | 0.824″ | 1.050″ | 0.113″ |
| 1 | 1.049″ | 1.315″ | 0.133″ |
| 1-1/4 | 1.380″ | 1.660″ | 0.140″ |
| 1-1/2 | 1.610″ | 1.900″ | 0.145″ |
| 2 | 2.067″ | 2.375″ | 0.154″ |
| 2-1/2 | 2.469″ | 2.875″ | 0.203″ |
| 3 | 3.068″ | 3.500″ | 0.216″ |
| 3-1/2 | 3.548″ | 4.000″ | 0.226″ |
| 4 | 4.026″ | 4.500″ | 0.237″ |
| 5 | 5.047″ | 5.563″ | 0.258″ |
| 6 | 6.065″ | 6.625″ | 0.280″ |
| 8 | 7.981″ | 8.625″ | 0.322″ |
| 10 | 10.020″ | 10.750″ | 0.365″ |
| 12 | 11.938″ | 12.75″ | 0.406″ |
| 14 | 13.124″ | 14.000″ | 0.438″ |
| 16 | 15.000″ | 16.000″ | 0.500″ |
| 18 | 16.876″ | 18.000″ | 0.562″ |
| 20 | 18.812″ | 20.000″ | 0.594″ |
| 24 | 22.624″ | 24.000″ | 0.688″ |
Dimensional Tolerances of JIS G 3445 Grade STKM 13A Tubing
| Execution | Wall tolerance | Size Range | OD Tolerance |
|---|---|---|---|
| Hot-rolled | ± 0.7 mm± 5 % x wallthickness + 0.1 mm | OD – 80 mmOD > 80 mmWall < 12 mmWall – 12 mm | ± 0.4 mm± 0.5 % of OD |
| Cold rolled or Cold drawn | ± 0.30 mm± 0.35 mm± 0.40 mm | OD < 40 mmOD 40 – 80 mmOD > 80 Wall Thickness < 6 mm Wall Thickness6 – 8 mm Wall Thickness > 8 | + 0.30/- 0 mm*+ 0.35/- 0 mm*+ 0.40/- 0 mm* |
| Hot-rolled peeled | ± 0.8 mm± (5 % x wall thickness+ 0.2 mm) | All sizesWall < 12 mmWall – 12 mm | + 0.25/- 0 mm |
Standard length tolerances of ASTM A519 Grade 1020 Tubes
| Component length (mm) | OD 30-100 mm | OD 100-254 mm |
|---|---|---|
| 10-100 | + 1.0/- 0 | + 2.0/- 0 |
| 100-600 | + 2.0/- 0 | + 3.0/- 0 |
| 600-1200 | + 3.0/- 0 | + 4.0/- 0 |
| 1200-5000 | + 5.0/- 0 | + 6.0/- 0 |
Physical Properties of STKM13A steel grade
| Temperature (°C) |
Modulus of elasticity (GPa) |
Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and | Thermal conductivity (W/m·°C) |
Specific thermal capacity (J/kg·°C) |
Density (kg/dm³) |
Poisson’s coefficient, ν |
|---|---|---|---|---|---|---|
| 622 | 165 | – | 14.3 | 111 | – | – |
| 529 | – | 31 | 34.2 | – | 322 | 212 |
ISO 683-1 C20E4 Delivery Conditions
- Annealed
- Hot Rolled
- Quenched and Tempered
- Normalized
- Stress Relieved
- Outer Diameter
- Manufacturing norms
- Steel grade and heat treatment
- Nominal dimensions
- Length
- Quantity and tolerances
- Wall Thickness
Schedule chart of E355+sr En 10305-1 Pipe
| 1/8" IPS(.405" O.D.) | SCH 40, 80 |
| 3 1/2" IPS( 4.000" O.D.) | SCH 10, 40, 80, 160, XXH |
| 1/4" IPS(.540" O.D.) | SCH 10, 40, 80 |
| 4" IPS(4.500" O.D.) | SCH 10, 40, 80, 160, XXH |
| 3/8" IPS(.675" O.D.) | SCH 10, 40, 80 |
| 5" IPS( 5.563" O.D.) | SCH 10, 40, 80, 160, XXH |
| 1/2" IPS(.840" O.D.) | SCH 5, 10, 40, 80, 160, XXH |
| 6" IPS(6.625" O.D.) | SCH 5, 10, 40, 80, 120, 160, XXH |
| 3/4" IPS(1.050" O.D.) | SCH 10, 40, 80, 160, XXH |
| 8 ” IPS(8.625" O.D.) | SCH 5, 10, 40, 80, 120, 160, XXH |
| 1" IPS:(1.315′ O.D.) | SCH 5, 10, 40, 80, 160, XXH |
| 10" IPS(10.750" O.D.) | SCH 10, 20, 40, 80 (.500), TRUE 80(.500) |
| 1-1/4" IPS(1.660" O.D.) | SCH 10, 40, 80, 160, XXH |
| 12" IPS(12.750" O.D.) | SCH 10, 20, 40(.375), TRUE40(.406), SCH80(.500) |
| 1-1/2" IPS(1.900" O.D.) | SCH 10, 40, 80, 160, XXH |
| 14" IPS(14.000" O.D.) | SCH10 (.188), SCH40 (.375) |
| 2" IPS(2.375" O.D.) | SCH 10, 40, 80, 160, XXH |
| 16" IPS(16.000" O.D.) | SCH10(.188), SCH40(.375) |
| 2 1/2" IPS(2.875" O.D.) | SCH 10, 40, 80, 160, XXH |
| 18" IPS (18.000" O.D.) | SCH-40 (.375) |
| Grade | Designation | Chemical Composition % | |||||
|---|---|---|---|---|---|---|---|
| C | SI | MN | P | S | |||
| 13 | A B C |
STKM 13A STKM 13B STKM 13C |
025 MAX | 035 MAX | 030 ~090 | 0040 MAX | 0040 MAX |
| 11 | A | STKM 11A | 012 MAX | 035 MAX | 060 MAX | 0040 MAX | 0040 MAX |
| 12 | A B C |
STKM 12A STKM 12B STKM 12C |
020 MAX | 035 MAX | 060 MAX | 0040 MAX | 0040 MAX |
| 16 | A B |
STKM 16A STKM 16B |
035 ~045 | 040 MAX | 040 ~100 | 0040 MAX | 0040 MAX |
| 17 | A B |
STKM 17A STKM 17B |
045 ~055 | 040 MAX | 040 ~100 | 0040 MAX | 0040 MAX |
| 14 | A B C |
STKM 14A STKM 14B STKM 14C |
030 MAX | 035 MAX | 030 ~100 | 0040 MAX | 0040 MAX |
| 15 | A B |
STKM 15A STKM 15B |
025 ~035 | 035 MAX | 030 ~100 | 0040 MAX | 0040 MAX |
| 18 | A B C |
STKM 18A STKM 18B STKM 18C |
018 MAX | 055 MAX | 150 MAX | 0040 MAX | 0040 MAX |
SCH 10s and 40 JIS G3445 STKM13A Pipe
| OD | DN | STKM13A Material | |
|---|---|---|---|
| SCH10S | STD SCH40 | ||
| INCH | MM | (mm) | (mm) |
| 1-1/4” | 32 | 2.77 | 3.56 |
| 1-1/2” | 40 | 2.77 | 3.68 |
| 2” | 50 | 2.77 | 3.91 |
| 1/2” | 15 | 2.11 | 2.77 |
| 3/4” | 20 | 2.11 | 2.87 |
| 1” | 25 | 2.77 | 3.38 |
| 2-1/2” | 65 | 3.05 | 5.16 |
| 3” | 80 | 3.05 | 5.49 |
| 4” | 100 | 3.05 | 6.02 |
| 5” | 125 | 3.4 | 6.55 |
| 6” | 150 | 3.4 | 7.11 |
| 8” | 200 | 3.76 | 8.18 |
| Hardness | 414 HBW |
|---|
STKM13A Material Tensile Strength
| Tensile strength | 951 MPa |
|---|
JIS G3445 Grade STKM 13A Applications
| Grade | STKM11A | STKM12A | STKM12B | STKM12C | STKM13A | STKM13B | STKM13C | STKM14A | STKM14B | STKM14C | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mechanical Properties | Tensile Strength | (MPa) | 230 | -294 | 235 | -343 | 240 | -392 | 248 | -471 | 238 | -373 | 245 | -441 | 252 | -510 | 242 | -412 | 251 | -500 | 256 | -549 | ||
| Yield Strength | (MPa) | — | 218 | -177 | 228 | -275 | 236 | -353 | 222 | -216 | 231 | -304 | 239 | -382 | 225 | -245 | 236 | -353 | 242 | -412 | ||||
| Elongation (%) | No.11: Specimen | 235 | 235 | 225 | 220 | 230 | 220 | 215 | 225 | 215 | 215 | |||||||||||||
| Flattening Test | Distance | between | that parts | (D=OD) | 1/2D | 2/3D | 2/3D | — | 2/3D | 3/4D | — | 3/4D | 7/8D | — | ||||||||||
| Bending Test | Bend | Angle | 180° | 90° | 90° | — | 90° | 90° | — | 90° | 90° | — | ||||||||||||
| Inside | Radius | (D=OD) | 4D | 6D | 6D | — | 6D | 6D | — | 6D | 8D | — | ||||||||||||
JIS G 3445 Grade STKM13A Material with Heat Treating Process
| Heat Treatment | 1247°C – 1661°C |
|---|
STKM 13A Welded Steel Tube in Varnished Condition
- Condition: Supplied in a varnished condition.
- Purpose: Prevents rust formation.
- Protection: Varnish provides a protective coating against corrosion.
- Appearance: Varnished tubes have an enhanced appearance and improved durability.
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