JIS G3445 Mechanical Tubes
Mechanical pipes have many advantages such as high strength, high pressure resistance, easy installation, low cost, and long service life. They are widely used in long-distance pipelines for oil, natural gas, coal gas, water, medicine, health, products, etc. and in petrochemical enterprise process pipe networks. , urban centralized heating pipe network, gas pipe network and other projects.
Gnee Steel (Tianjin) Co., Ltd. is one of the most reliable manufacturers and suppliers of jis g3445 mechanical tubes in China, also supports customized service with low price. Welcome to wholesale discount jis g3445 mechanical tubes for sale here from our factory. Contact us for free sample.
JIS G3445 Carbon steel pipes for mechanical structures Seamless steel pipe specifications, standards and markings Seamless steel pipes are widely used in nuclear installations, natural gas, petrochemical, shipbuilding and boiler industries.
Outside Diameter：12.7mm-323.8mm
Wall thickness：3.0mm-12.7mm
Length：6000mm,12000m or specified length as required.
Chemical Compositions(%) of JIS G3445
| 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 |
Mechanical properties
| 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 |
Tolerance on Outside Diameter in JIS G3445
| Standard | Tolerance on outside diameter (mm) | |
| JIS G3445 | =50 | ±0.5 |
| >50 | ±1% | |
| JIS G3445 | <50 | ±0.25 |
| >50 | ±0.5% | |
| JIS G3445 | <25 | ±0.12 |
| >25-40 | ±0.15 | |
| >40-50 | ±0.18 | |
| >5:.60 | ±0.20 | |
| >60-70 | ±0.23 | |
| >70-80 | ±0.25 | |
| >80-90 | ±0.30 | |
| >90-100 | ±0.40 | |
| >100 | ±0.5% | |
Tolerance on Wall Thickness in JIS G3445
| Standard | Tolerance on wall thickness (mm) | |
| JIS G3445 | <=4 | -0.5,+0.6 |
| >4 | -12.5%, +15% | |
| JIS G3445 | <=3 | ±0 .3 |
| >3 | ±10% | |
| JIS G3445 | <=2 | ±0.15 |
| >2 | ±8% | |
GNEE JIS G3445 Seamless Mechanical Tubing
About GNEE
With 15 years of experience in manufacturing and exporting, GNEE can offer competitive steel tubes with the following details:
Size: As per customer's requirement.
Standard: ASTM A500 GR.A/B/C, S235JR/275JR/355JR/S275J0/S355J0/S275J2/S355J2
Surface: Black/pre-galvanized or hot-dip galvanized/oiled/painted
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