Black Mild 4mm Thickness Seamless Steel Pipe Cold Drawn
Cold Drawn Seamless Mild Steel Tube Carbon Steel Pipe Alloy Steel Pipe Seamless Black Steel Pipe
1.Commodity name:Seamless astm a106/a53grb sch40 cold drawn steel pipe
2.Standard:GB/T8713,GB/T3639,DIN2391,EN10305,ASTMA519,ASTMA106-2006
3.Grade: 10#(St37/St37.2/St35.8),20#(aisi1020,ck20,St42-2/St45-8/St45-4),
45#(aisi1045,ck45,ASTM A1045),st52(16Mn,Q345D),25Mn(stkm13c-t),27SiMn
4.OD:30-250mm;
5.ID tolerance:H8,H9,H10
6. Wall thickness:10%×ID
7.Surface roughness:Ra 0.02— 0.4μm
8. Delivery condition:BK,BKW,BKS,GBK,NBK
9.Package: steel strip bundles, black paint coating, beveled ends or plain
10.Payment Terms: L/C or T/T(30% deposit and 70% balance against B/L copy)
11.Price Item:EXW,FOB,CFR or CIF
12.Delivery Time: Usually 15 working days after order confirmed& getting T/T deposit or original L/C
Mechanical Performance
| Delivery Condition | Cold drawn+ stress-relieved(BK+S)(SR) | Cold fished (hard)(BK) | |||
| Steel Grade |
Tensile strength (Rm Mpa) |
Yield strength | Elogation A5% |
Tensile strength (Rm Mpa) |
Elogation A5% |
| 20# |
≥520
|
≥375 | ≥15 | ≥550 | ≥8 |
| 45# | ≥600 | ≥520 | ≥10 | ≥640 | ≥5 |
| E355(Q345B,St52) | ≥600 | ≥520 | ≥14 | ≥640 | ≥5 |
| 25Mn | ≥600 | ≥510 | ≥15 | ≥640 | ≥5 |
| 27SiMn | ≥760 | ≥610 | ≥10 | ≥800 | ≥5 |
ID Tolerance:
| OD | GB/T3639(GB8713) | DIN2391(EN10305) | Our Tolerance | Best Quality |
| 31-40mm | ±0.15mm | ±0.15mm | ±0.05mm | ±0.03mm |
| 41-50mm | ±0.20mm | ±0.20mm | ±0.05mm | ±0.03mm |
| 51-60mm | ±0.25mm | ±0.25mm | ±0.08mm | ±0.03mm |
| 61-70mm | ±0.30mm | ±0.30mm | ±0.10mm | ±0.05mm |
| 71-160mm | ±0.30mm | ±0.30mm | ±0.10mm | ±0.05mm |
| Tolerance in WT | ±0.12mm | ±0.10mm | ±0.05mm | ±0.03mm |
Delivery condition:
1. NBK(+N)
after cold forming, eventually above phase transition point, in a protective atmosphere of annealing oxidation medium
2. GBK(+A)
after cold forming, annealing in non oxidizing medium protective gas
3. BK(+C)
the final heat treatment after cold forming, therefore small steel pipe plastically, the plastically degree does not guarantee
4. BKW(+LC)
after final heat treatment, a tiny cold drawing deformation, continue again when machining steel pipe allowed inside certain limits cold deformation(bending, flaring)
5. BKS(+SR)
have a stress relief after cold forming, heat treatment, steel pipe can be carried out within a certain limit in the appropriate processing again
Application:
1.Hydraulic Cylinder Tube---Used in the hydraulic cylinder of the heavy machinery, Cranes, excavator also forklifts. Material is various, mainly STKM-13CT, ST52, CK45 and 1020. We can work and get the mechanical property of the clients need and extended the life of the hydraulic cylinder.
2.SRB tube ----- Used in Elevator,buffer and Hydraulic Cylinder .This kind tube have a better roughness inner the tube, ra0.2-0.4um and can use directly in the hydraulic cylinder tube.
Range: ID 50-250mm and Length can work at most 6M.
3.Cold finished tube---- Widely Used. Processing range 30-300mm, biggest length is 11M.
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