| Payment Type: | L/C,T/T,D/P |
| Incoterm: | FOB,CFR,CIF,EXW |
| Transportation: | Ocean,Land,Express |
| Port: | Tianjin,Qingdao,Shanghai |
Model No.: JIS G3445
Standard: Jis, Gb, Din
Material: A53-A369, Q195-Q345, 10#-45#, Crni Alloy, Mn-V Alloy, St35-St52, Cr-Mo Alloy
Section Shape: Round
Place Of Origin: China
Application: Fluid Pipe, Boiler Pipe, Structure Pipe
Production Process: Hot Rolled
Certification: Ce, Api
Special Tube: Api Pipe, Thick Wall Pipe
Whether Alloy: Is Alloy
Tolerance: ±1%
Category: Seamless Steel Pipe
Processing Service: Bending, Decoiling, Punching, Cutting
| Selling Units | : | Ton |
| Package Type | : | Standard marine packaging, or as required by the customer |
| Picture Example | : |
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JIS G3445 Carbon steel tubes for machine structural purposes Seamless Pipe Specification, standard and identification Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries.
| Grade | C | Si | Mn | P | S |
| STKM11A | ≤0.12 | ≤0.35 | ≤0.60 | ≤0.040 | ≤0.040 |
| STKM12A | ≤0.20 | ≤0.35 | ≤0.60 | ≤0.040 | ≤0.040 |
| STKM12B | ≤0.20 | ≤0.35 | ≤0.60 | ≤0.040 | ≤0.040 |
| STKM12C | ≤0.20 | ≤0.35 | ≤0.60 | ≤0.040 | ≤0.040 |
| STKM13A | ≤0.25 | ≤0.35 | 0.30-0.90 | ≤0.040 | ≤0.040 |
| STKM13B | ≤0.25 | ≤0.35 | 0.30-0.90 | ≤0.040 | ≤0.040 |
| STKM13C | ≤0.25 | ≤0.35 | 0.30-0.90 | ≤0.040 | ≤0.040 |
| STKM14A | ≤0.30 | ≤0.35 | 0.30-1.00 | ≤0.040 | ≤0.040 |
| STKM14B | ≤0.30 | ≤0.35 | 0.30-1.00 | ≤0.040 | ≤0.040 |
| STKM14C | ≤0.30 | ≤0.35 | 0.30-1.00 | ≤0.040 | ≤0.040 |
The tubes shall be practically straight. and the two ends shall be at right angles to the axis of the tube
The tubes shall be free from defects detrimental to practical use.
The surface finish of the tubes, when especially specified shall be agreed upon by the purchaser and the manufacturer.
| Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation (%) |
| STKM11A | \ | ≥290 | ≥35 |
| STKM12A | ≥175 | ≥340 | ≥35 |
| STKM12B | ≥275 | ≥390 | ≥25 |
| STKM12C | ≥355 | ≥470 | ≥20 |
| STKM13A | ≥215 | ≥370 | ≥30 |
| STKM13B | ≥305 | ≥440 | ≥20 |
| STKM13C | ≥380 | ≥510 | ≥15 |
| STKM14A | ≥245 | ≥410 | ≥25 |
| STKM14B | ≥355 | ≥500 | ≥15 |
| STKM14C | ≥410 | ≥550 | ≥15 |
The tubes shall be manufactured by seamless process, electric resistance welding process, or butt welding process, and those of other grades shall be manufactured by seamless process or electric resistance welding process. The tube shall be as manufactured or as cold-finished condition, or they shall be subjected to appropriate heat treatment.
| Grade | Designation | |
| Grade 11 | A | STKM 11A |
| Grade 12 | A | STKM 12A |
| B | STKM 12B | |
| C | STKM 12C | |
| Grade 13 | A | STKM 13A |
| B | STKM 13B | |
| C | STKM 13C | |
| Grade 14 | A | STKM 14A |
| B | STKM 14B | |
| C | STKM 14C | |
| Grade 15 | A | STKM 15A |
| C | STKM 15C | |
| Grade 16 | A | STKM 16A |
| C | STKM 16C | |
| Grade 17 | A | STKM 17A |
| C | STKM 17C | |
| Grade 18 | A | STKM 18A |
| B | STKM 18B | |
| C | STKM 18C | |
| Grade 19 | A | STKM 19A |
| C | STKM 19C | |
| Grade 20 | A | STKM 20A |
JIS G3445 steel tubes for machine structural purposes
The sub classification letter symbols A, B and C are used to indicate distinction of method of manufacturing the tube, cold working process, heat treatment, etc.
| NUBER | GRADE | NUBER | GRADE | NUBER | GRADE | NUBER | GRADE | |
| D 3517 | Grade 11 A | STKM 11 A | A513 | MT1010 | G-3445 | STKM11A | – | – |
| A519 | MT1010 | |||||||
| Grade 12A | STKM 12 A | A513 | MT1015 | STKM12A | 980 | CDS-3 | ||
| A519 | MT1015 | |||||||
| Grade 12 B | STKM 12 B | – | – | STKM12B | – | – | ||
| Grade 12C | STKM 12C | A512 | MT1015 | STKM12C | – | – | ||
| A513 | ||||||||
| Grade 13 A | STKM 13 A | A512 | MT 1025 | STKM13A | – | – | ||
| A513 | MTX1025 | |||||||
| A519 | MT 1025 | |||||||
| Grade13B | STKM 13 B | – | – | STKM13B | 980 | CDS-4 | ||
| Grade13 C | STKM 13 C | – | – | STKM13C | – | – | ||
| Grade14 A | STKM 14 A | A513 | MT1030 | STKM14A | 1717 | CDS-103 | ||
| A519 | MT1030 | |||||||
| Grade14 B | STKM 14 B | – | – | STKM14B | – | – | ||
| Grade14 C | STKM 14 C | – | – | STKM14C | – | – | ||
| Grade15 A | STKM 15 A | A513 | MT1033 | STKM15A | 1717 | CDS-105 | ||
| Grade15 C | STKM 15 C | – | – | STKM15C | – | – | ||
| Grade16 A | STKM 16 A | A519 | MT1040 | STKM16A | 980 | CDS-5 | ||
| Grade16 C | STKM 16 C | – | – | STKM16C | – | – | ||
| Grade17 A | STKM 17 A | A519 | MT1050 | STKM17A | 980 | CDS-7 | ||
| 1717 | CDS-107 | |||||||
| Grade17 C | STKM 17 C | – | – | STKM17B | – | – | ||
| Grade18 A | STKM 18 A | A519 | MT1524 | STKM18A | 980 | CDS-9 | ||
| Grade18 B | STKM 18 B | – | – | STKM18B | – | – | ||
| Grade18 C | STKM 18 C | – | – | STKM18C | – | – | ||
| Grade19 A | STKM 19 A | – | – | – | – | – | ||
| Grade19 C | STKM 19 C | – | – | – | – | – | ||
| Grade20 A | STKM 20 A | – | – | – | – | – | ||
The tubes shall be practically straight. and the two ends shall be at right angles to the axis of the tube. The tubes shall be free from defects detrimental to practical use.
The tubes shall be manufactured by seamless process, electric resistance welding process, or butt welding process, and those of other grades shall be manufactured by seamless process or electric resistance welding process. The tube shall be as manufactured or as cold-finished condition, or they shall be subjected to appropriate heat treatment.
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