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Cold Drawn Workshop |
Heat Treatment Workshop |
Workshop and equipment in en OCTG base |
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The ASTM seamless steel pipes are extensively applied in petroleum, chemical,
power, boiler, and machinery industries. Our prefect products and preferential
price have won us customers' trust and consistently favorable comments.
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Cold Drawn Workshop |
Heat Treatment Workshop |
Workshop and equipment in en OCTG base |
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Grade | C | Si | Mn | P | S |
STPG370 | ≤0.25 | ≤0.35 | 0.30-0.90 | ≤0.040 | ≤0.040 |
STPG410 | ≤0.30 | ≤0.35 | 0.30-1.00 | ≤0.040 | ≤0.040 |
Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation (%) |
JIS G3454 STPG370 | ≥216 | ≥370 | ≥30 |
JIS G3454 STPG410 | ≥245 | ≥410 | ≥25 |
Grade | C | Si | Mn | P | S | Cr | Mo |
JIS G3462 STB A12 | 0.10~0.20 | 0.10~0.50 | 0.30~0.80 | <0 td> | <0 td> | — | 0.45~0.65 |
JIS G3462 STB A13 | 0.15~0.25 | 0.10~0.50 | 0.30~0.80 | <0 td> | <0 td> | — | 0.45~0.65 |
JIS G3462 STB A24 | <0 td> | <0 td> | 0.30~0.60 | <0 td> | <0 td> | 1.90~2.60 | 0.87~1.10 |
Grade | tensile strength kgf/mm²{N/mm²} | yield strength kgf/mm²{N/mm²} |
JIS G3462 STB A12 | <39{382} | <21{206} |
JIS G3462 STB A13 | <42{412} | <21{206} |
JIS G3462 STB A24 | <42{412} | <21{206} |
O.D. | TOLERANCE ON OUTSIDE DIAMETER | ||||
HOT ROLLED SEAMLESS PIPES | SEAMLESS PIPES THROUGH QUENCH AND NORMALIZED | COLD DRAWN SEAMLESS PIPES THRONG, THE HOT TREATMENT EXCEPT QUENCH AND NORMALIZED | ELECTRIC WELDED PIPES EXCEPT COLD DRAWN | COLD DRAWN ELECTRIC WELDED PIPES | |
MM | |||||
< td> | +0.4 -0.8 | ±0.25 | ±0.10 | ±0.15 | ±0.10 |
<25.40 | ±0.25 | ±0.15 | ±0.20 | ±0.15 | |
<40-50 | ±0.25 | ±0.20 | ±0.25 | ±0.20 | |
<50.60 | ±0.25 | ±0.25 | ±0.30 | ±0.25 | |
<60-80 | ±0.30 | ±0.30 | ±0.40 | ±0.30 | |
<80.100 | ±0.40 | ±0.40 | -0.60,+0.40 | ±0.40 | |
<100-120 | +0.4 -1.2 | -0.60,+0.40 | -0.60,+0.40 | -0.80,+0.40 | -0.60,+0.40 |
<120-160 | -0.80,+0.40 | -0.80,+0.40 | -1.00,+0.40 | -0.80,+0.40 | |
<160-200 | -1.8,+0.4 | -1.20,+0.40 | -1.20,+0.40 | -1.20,+0.40 | -1.20,+0.40 |
<200 | -2.4,+0.4 | -1.60,+0.40 | -1.60,+0.40 | -1.60,+0.40 | -1.60,+0.40 |
WALL THICKNESS (MM) | HOT ROLLED SEAMLESS PIPE | COLD DRAWN SEAMLESS PIPE | ELECTRIC WELDED PIPE | |||
O.D(MM) | O.D(MM) | O.D(MM) | ||||
< td> | <100 | < td> | <40 | < td> | <40 | |
(%) | ||||||
< td> | - | - | -0,+0.4mm | +22 -0 | -0,+0.3mm | +18 0 |
<2-2.4 | -0,+40 | - | +20 -,0 | +18 -0 | ||
<2.4-3.8 | -0,+35 | -0,+35 | ||||
<3.8-4.6 | -0,+23 | -0,+33 | ||||
<4.6 | -0,+28 | -0,+28 |
ITEM | TOLERANCE AN LENGTH | |
OD<50mm td> | <7m td> | -0, +7mm |
<=7m | Every 3m increase in length, the plus tolerance be increased by 3mm with a maximum of 15mm | |
OD<=50mm | <7m td> | -0, +10mm |
<=7m | Every 3m increase in length, the plus tolerance be increased by 3mm with a maximum of 15mm | |
OD: Outside Diameter |
Standard / Grade | C | Si | Mn | P | S |
JIS G3455 STS370 | ≤0.25 | 0.10-0.35 | 0.30-1.10 | ≤0.035 | ≤0.035 |
JIS G3455 STS410 | ≤0.30 | 0.10-0.35 | 0.30-1.40 | ≤0.035 | ≤0.035 |
JIS G3455 STS480 | ≤0.33 | 0.10-0.35 | 0.30-1.50 | ≤0.035 | ≤0.035 |
Standard / Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation (%) |
JIS G3455 STS370 | ≥216 | ≥370 | ≥30 |
JIS G3455 STS410 | ≥245 | ≥410 | ≥25 |
JIS G3455 STS480 | ≥275 | ≥480 | ≥25 |
APPLICATION | TOLERANCE ON OUTSIDE DIAMETER | TOLERANCE ON WALL THICKNESS | ||
---|---|---|---|---|
Hot Rolled Seamless Pipes | < mmtd> | ±0.5mm | < mmtd> | ±0.5mm |
<50-160mm | ±1% | |||
<160-200mm | ±1.6mm | <4mm | ±12.5% | |
<200mm | ±0.8% | |||
More that 350mm, the Tolerance is ±0.5% | ||||
Cold Drawn Seamless Pipes and Electric Resistant Welded Pipes | < mmtd> | ±0.3mm | < mmtd> | ±0.2mm |
<40mm | ±0.8% | <2mm | ±10% | |
More than 350 mm the Tolerance is ±0.5% |
O.D.(mm) | Tolerance(%) |
<13 td> | ±0.25 |
<13-25 | ±0.40 |
<25-40 | ±0.60 |
<40-65 | ±0.80 |
<65-90 | ±1.00 |
<90-140 | ±1.20 |
<140 | By agreement |
W.T.(mm) | Tolerance |
< td> | -0.5,+0.6 |
<4 | -12.5%, +15% |
Steel grade | Steel grade(old) | C | Si | Mn | P | S | Cr | Mo |
SCr420TK | – | 0.18~0.23 | 0.15~0.35 | 0.60~0.85 | <0 td> | <0 td> | 0.90~1.20 | 0.15~0.30 |
SCM415TK | – | 0.13~0.18 | 0.15~0.35 | 0.60~0.85 | <0 td> | <0 td> | 0.90~1.20 | 0.15~0.30 |
SCM418TK | – | 0.16~0.21 | 0.15~0.35 | 0.60~0.85 | <0 td> | <0 td> | 0.90~1.20 | 0.15~0.30 |
SCM420TK | – | 0.18~0.23 | 0.15~0.35 | 0.60~0.85 | <0 td> | <0 td> | 0.90~1.20 | 0.15~0.30 |
SCM430TK | As STKS1 | 0.33~0.38 | 0.15~0.35 | 0.60~0.85 | <0 td> | <0 td> | 0.90~1.20 | 0.15~0.30 |
SCM435TK | As STKS3 | 0.33~0.38 | 0.15~0.35 | 0.60~0.85 | <0 td> | <0 td> | 0.90~1.20 | 0.15~0.30 |
SCM440TK | – | 0.38~0.43 | 0.15~0.35 | 0.60~0.85 | <0 td> | <0 td> | 0.90~1.20 | 0.15~0.30 |
Grade | C | Si | Mn | P | S | Ni | Cr | Mo |
STH11 | ≤0.50 | 0.10-0.35 | ≤1.80 | ≤0.035 | ≤0.035 | / | / | / |
STH12 | 0.30-0.41 | 0.10-0.35 | 1.35-1.70 | ≤0.030 | ≤0.030 | / | / | / |
STH21 | 0.25-0.35 | 0.15-0.35 | 0.40-0.90 | ≤0.030 | ≤0.030 | ≤0.25 | 0.80-1.20 | 0.15-0.30 |
STH22 | 0.33-0.38 | 0.15-0.35 | 0.40-0.90 | ≤0.030 | ≤0.030 | ≤0.25 | 0.80-1.20 | 0.15-0.30 |