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 |
We also provide CNC precision machining services for our clients, covering industries such as energy, petrochemicals, steel, engineering machinery, plastics, prevention and control, hydraulics, healthcare, and food. Please feel free to send us drawings for inquiries.
