High precision cold drawn seamles steel tuber
The specifications of Changjin cold-drawn pipes/scraped-rolled pipes range from 50mm to 273mm, and the steel types include 20#、45#、03458、0345D、25Mn、27SiMn、SAE1026、STKM13C and other various alloy steels. Scraping/honing processing capacity up to 14 meters. The annual production capacity reaches 20,000 tons.
Email: [email protected]
WhatsApp: 0086-18301953841
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Commonly used grade of steel and chemical component |
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20#,45#,Q345B,Q345D,25MN,27SIMN,SAE1026,STKM13C
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Grade of steel
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CHEMICAL COMPOSITION,%
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C
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Si
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Mn
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P
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S
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Cr
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Ni
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V
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AI
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≤ ≥
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20#
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0.17-0.24
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0.17-0.37
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0.35-0.65
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0.035
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0.035
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0.250
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0.250
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45#
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0.42-0.50
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0.17-0.37
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0.50-0.80
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0.035
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0.035
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0.250
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0.300
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Q345B
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≤0.2
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≤0.5
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1.00-1.60
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0.030
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0.030
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0.030
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0.250
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0.08
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Q345D
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≤0.2
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≤0.5
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1.00-1.60
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0.030
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0.030
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0.250
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0.250
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0.150
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0.015
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25Mn
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0.22-0.29
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0.17-0.37
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0.70-1.00
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0.035
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0.035
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27SiMn
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0.24-0.32
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1.10-1.40
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1.10-1.40
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0.035
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0.035
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0.300
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0.300
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E355(ST52)
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≤0.22
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≤0.55
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≤1.6
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0.025
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0.025
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0.250
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0.250
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SAE1026
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0.22-0.28
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0.15-0.35
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0.60-0.90
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0.040
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0.050
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Technical Tarameters
| Type | ||||||
| ID (rm) | Length(mm) | Straightness | Tolerance | Wall Variation | Roughness (um) | |
| Cold-drawn | 30-250 | ≤10.5M | 0.3- 1/1000mm | ±5% | 0.8-1.5 | |
| Honed | 30-250 | ≤6M | 0.3- 1/1000mm | H8-H9 | ±5% | 0.4-0.8 |
| SRB | 60-200 | ≤6M | 0.3- 1/1000mm | H8 | ±5% | 0.2 |
Mechanical Property
| Steel type | ||||||
| TS(Mpa) | Elongation(%) | TS(Mpa) | YS(Mpa) | Elongation(%) | Hardness (HB) | |
| 20# | ≥550 | 25 | 2510 | 2470 | ≥12 | 175 |
| 45# | ≥650 | 24 | ≥600 | ≥520 | ≥12 | 207 |
| 16Mn | z640 | ≥10 | ≥600 | ≥520 | ≥15 | 190 |
| 25Mn | ≥640 | 210 | ≥600 | ≥510 | ≥15 | 195 |
| 27SiMn | 2840 | ≥7.5 | 2800 | ≥720 | ≥10 | 195 |
Honing/Scraping Technical Tarameters
| inner diameterH?H11dimension(mm) | inner diameter deviation | ||||
| H7 | H8 | H9 | H10 | H11 | |
| 30 | +0.0210 | +0.0330 | +0.0520 | +0.0840 | +0.1300 |
| >30-50 | +0.0250 | +0.0390 | +0.0620 | +0.1000 | +0.1600 |
| >50-80 | +0.030 | .0460 +0.0 | +0.0740 | +0.1200 | +0.1900 |
| >80-120 | +0.0350 | +0.0 .0540 | +0.1000 | +0.1400 | +0.2200 |
| >120-180 | +0.040 | 0630 +0.06 | +0.1 0.1150 | +0.1600 | +0.2500 |
| >180-250 | +0.0 +0.0460 | +0.072 720 | +0.13 0.1300 | +10.1 10.1850 | +0.2900 |
| >250-315 | +0.0520 +0.0 | +0.08 .0810 | +0.140 0.1400 | +0.21 2100 | +0.3200 |
| >315-400 | +0.0570 | +0.0890 .0890 | +0.1400 0.1400 | +0.23 0.2300 | +0.3600 |
