TORICH INTERNATIONAL LIMITED
TORICH INTERNATIONAL LIMITED The Steel Tube Maker
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Good Straightness Seamless Steel Tubes for Drilling GB/T 9808 37SiMn 38CrMoAl
Spec:
Material:37SiMn 38CrMoAl
Size Range:OD:6-95mm
WT:1-10mm
General Length:4-12m
Chemical Compositon
| CHEMICAL COMPOSITION % max | |
| P | S |
| 0.030 | 0.030 |
Tolerance of Outer Diameter and Wall Thickness
| Standard | Production Method | Tube Size | Tolerance | |
| GB/T 9808-2008 | Hot rolled | OD | (+1.0%D) or +0.65 (-0.5%D) -0.35 | |
| WT | ≤10 | (+15%S)or +0.45 (-10%S) -0.35 | ||
| >10 | (+12.5%S, -10%S) | |||
| Cold Drawn(rolled) | OD | ±0.50%D or ±0.20 | ||
| WT | ±8%S or ±0.15 | |||
| Q(N)/ T118-2010 | Cold Drawn | OD | OD | ±0.40%D or ±0.20 |
| WT | WT | ±7%S or ±0.15 | ||
Bending Degree
| Nominal Wall Thickness/mm | Bending Degree/(mm/m) |
| ≤15 | ≤1.5 |
| ＞15 | ≤2.0 |
The bending degree of the wire-line drill rod is not larger than 1.0 mm per meter.
Internal Path Rod Test
| Diameter of the Path Rod | Length of the Path Rod(mm) |
| d-1.0 | 300 |
| d=D(diameter of the tube)-2S(wall thickness of the tube) | |
| No. | Grade | Tensile Strangth Rm/MPa | Specifies the non-proportional extension strength Rp0.2/MPa | Percentage elongation after fracture |
| No less than | ||||
| 1 | ZT380 | 640 | 380 | 14 |
| 2 | ZT490 | 690 | 490 | 12 |
| 3 | ZT520 | 780 | 520a | 15b |
| 4 | ZT540 | 740 | 540 | 12 |
| 5 | ZT590 | 770 | 590 | 12 |
| 6 | ZT640 | 790 | 640 | 12 |
| 7 | ZT740 | 840 | 740 | 10 |
a Grade ZT520 measure RP0.5 | ||||
Testing items and sampling quantity for steel tubes
| Serial number | Testing item | Sampling quantity |
| 1 | Chemical composition | 1 sample from each furnace |
| 2 | Tensile test | 1 sample from each batch |
| 3 | Ultrasonic examination | All |
| 4 | Eddy current test | All |
| 5 | Magnetic flux leakage test | All |
Grade comparison table
| This standard | JIS G 3465-2006 | Related industry standard |
| ZT380 | — | DZ240 |
| ZT490 | — | DZ250 |
| ZT520 | STM-R780 | — |
| ZT540 | — | DZ255 |
| ZT590 | — | DZ260 |
| ZT640 | — | DZ265 |
| ZT740 | — | DZ275 |
Mining Tubes with Alloy :For Geological Drill underground for Oil and mineral, for mining
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