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[China]
Trade Verify
Address: Suite 1004, Hongan Plaza, #258 Die Yuan Road, Yinzhou District, Ningbo City, China
Contact name:Richard SHEN
TORICH INTERNATIONAL LIMITED |
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Verified Suppliers
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GB24187 Cold rolled low carbon steel Cold-drawn precision single welded steel tubes
Product Name:GB24187 Cold rolled low carbon steel Cold-drawn precision single welded steel tubes
Standard: GB24187
OD: 3-420mm
WT: 0.5-50mm
Length: 1-12m or according to customers' actual application and production.
Application:Machinery
Steel Grade:10#.20#
Technology:cold drawn ,cold rolled
Characteristic:
Good concentricity
Good surface quality
Good OD and ID tolerance
High Precision
Stable quality
Smooth Roughness
TORICH QUALITY ASSURANCE
Table1 The type, state and code of the steel tube surface
| Type | State | Code |
| Bright Surface | No coating on the inner and outer surface of steel pipe | SL |
| Copper plated surface | Copper plating on the outer surface of steel tube | Cu |
| Galvanized surface | Galvanized or zinc alloy on the outer surface of steel pipe | Zn |
| Double-sided copper plating surface | The inner and outer surfaces of the steel pipe are plated with copper | Cu/Cu |
| External galvanized inner copper plating surface | Galvanized or zinc alloy on the outer surface of steel pipe, copper plating on the inner surface | Zn/Cu |
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Table 2 Outer diameter, wall thickness and theoretical weight
| OD/mm | WT/mm | |||||||||
| 0.30 | 0.40 | 0.50 | 0.60 | 0.65 | 0.70 | 0.80 | 0.90 | 1.00 | 1.30 | |
| theoretical weight /(kg/m) | ||||||||||
| 3.18 | 0.0213 | 0.0274 | 0.0330 | |||||||
| 4.00 | 0.0274 | 0.0355 | 0.0432 | 0.0503 | ||||||
| 4.76 | 0.0330 | 0.0430 | 0.0525 | 0.0616 | 0.0659 | 0.0701 | ||||
| 5.00 | 0.0348 | 0.0454 | 0.0555 | 0.0651 | 0.0697 | 0.0742 | ||||
| 6.00 | 0.0422 | 0.0552 | 0.0678 | 0.0799 | 0.0858 | 0.0915 | 0.1026 | 0.1132 | 0.1233 | |
| 6.35 | 0.0448 | 0.0587 | 0.0721 | 0.0851 | 0.0914 | 0.0975 | 0.1095 | 0.1210 | 0.1319 | |
| 7.94 | 0.0565 | 0.0744 | 0.0917 | 0.1086 | 0.1169 | 0.1250 | 0.1409 | 0.1563 | 0.1712 | 0.2129 |
| 8.00 | 0.0570 | 0.0750 | 0.0925 | 0.1095 | 0.1178 | 0.1260 | 0.1421 | 0.1576 | 0.1726 | 0.2148 |
| 9.53 | 0.0683 | 0.0901 | 0.1113 | 0.1321 | 0.1423 | 0.1524 | 0.1722 | 0.1915 | 0.2104 | 0.2639 |
| 10.00 | 0.0718 | 0.0947 | 0.1171 | 0.1391 | 0.1499 | 0.1605 | 0.1815 | 0.2020 | 0.2220 | 0.2789 |
| 12.00 | 0.0866 | 0.1144 | 0.1418 | 0.1687 | 0.1819 | 0.1951 | 0.2210 | 0.2464 | 0.2713 | 0.3430 |
| 12.70 | 0.0917 | 0.1213 | 0.1504 | 0.1790 | 0.1932 | 0.2072 | 0.2348 | 0.2619 | 0.2885 | 0.3655 |
| 14.00 | 0.1014 | 0.1342 | 0.1665 | 0.1983 | 0.2140 | 0.2296 | 0.2604 | 0.2908 | 0.3206 | 0.4072 |
| 15.88 | 0.1153 | 0.1527 | 0.1896 | 0.2261 | 0.2441 | 0.2621 | 0.2975 | 0.3325 | 0.3670 | 0.4674 |
| 16.00 | 0.1162 | 0.1539 | 0.1911 | 0.2279 | 0.2461 | 0.2641 | 0.3000 | 0.3352 | 0.3699 | 0.4713 |
| 18.00 | 0.1310 | 0.1736 | 0.2158 | 0.2575 | 0.2781 | 0.2987 | 0.3393 | 0.3795 | 0.4192 | 0.5354 |
Theoretical weight of no additional coating, density of steel is
7.85 kg/ | ||||||||||
Table3 Allowable deviation of outer diameter of steel pipe
| Outer diameter | Common precision | High precision |
| ＜4.76 | ±0.08 | ±0.05 |
| 4.76-8.00 | ±0.12 | ±0.07 |
| ＞8.00-12.00 | ±0.16 | ±0.10 |
| ＞12.00 | ±0.20 | ±0.12 |
Table4 Permissible deviation of steel tube wall thickness
| Wall thickness | Permissible deviation |
| ＜0.70 | ±0.05 |
| ≥0.70 | ±0.07 |
Table5 Allowable deviation of specified length of steel pipe
| Length | Allowable deviation |
| ≤2000 | +4 0 |
| ＞2000-5000 | +7 0 |
| ＞5000-8000 | +10 0 |
TABLE 6 Chemical Composition Of Steel Strip (Mass Fraction)%
| Category | C | Si | Mn | P | S |
| Cold rolled low carbon steel strip | ≤0.08 | ≤0.03 | ≤0.30 | ≤0.030 | ≤0.030 |
| Cold rolled ultra low carbon steel strip | ≤0.008 | ≤0.03 | ≤0.25 | ≤0.020 | ≤0.030 |
TABLE 7 Mechanical Properties Of Cold Rolled Low Carbon Steel Strip
Thickness /mm | Tensile Strength
| Yield Strength
| Elongation A/% |
| 0.25~＜0.35 | ≥270 | ≥32 | |
| 0.35~＜0.50 | ≥34 | ||
| ≥0.50 | ≥36 | ||
a Replace with b Sample type of sample number D14 in GB/T 228-2002. | |||
TABLE 8 Mechanical Properties Of Cold Rolled Ultra-low Carbon Steel Strip
Thickness /mm | Tensile Strength
| Yield Strength
| Elongation A/% |
| ≤0.50 | ≥280 | 130~250 | ≥38 |
| ＞0.50 | ≥40 | ||
a Replace with b Sample type of sample number P14 in GB/T 228-2002. | |||
TABLE 9 Mechanical properties of steel pipe
| Category | Tensile Strength
| Yield Strength
| Elongation A/% |
| Ordinary steel pipe(MA) | ≥270 | ≥180 | ≥14 |
| Soft steel tube(MB) | ≥230 | 150~220 | ≥35 |
a Replace with b Sample type of sample number S7 in GB/T 228-2002. | |||
TABLE 10 Inspection Items, Test Methods And Sampling Quantity
| NO | Inspection Items | Sampling Method ,Test Methods | Sampling Quantity |
| 1 | Chemical composition | GB/T 223, GB/T 4336, GB/T 20066 GB/T 20123, GB/T 20126 | Take 1 samples per furnace |
| 2 | Mechanical property | GB/T 228 | Take 1 samples per batch |
| 3 | Flattening test | GB/T 246 | Take 1 samples per furnace |
| 4 | Expansion test | GB/T 242 | Take 1 samples of two steel pipes per batch |
| 5 | Bending test | GB/T 244 | Take 1 samples per batch |
| 6 | Hydraulic test | GB/T 241 | Take 1 samples per batch |
| 7 | Flared test | Appendix A | Take 1 samples per batch |
| 8 | Requirements for the inner surface of high definition clean steel pipe | Appendix B | Consultation between Supply and demand parties |
| 9 | Outer coating | Appendix C | Consultation between Supply and demand parties |
| 10 | Residuals of internal surface cleanliness | Appendix D | Consultation between Supply and demand parties |
Table A The Size of Single Double Flaring
Out Dimensions D | Single-Layer expansion diameter D1 | Double-Layer expansion diameter D2 | The minimum length of Double-Layer expansion diameter L | Inner diameter of double-lay expansion D3 | The inner diameter of flaring round corner r |
| 3.18 | 4.5 | 5.0 | 1.0 | The maximum size :(D-2S)+0.25 The minimum size:(D-2S)-0.50 | 1.0±0.3
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| 4.00 | 5.4 | 6.0 | 1.0 | ||
| 4.76 | 6.3 | 7.0 | 1.0 | ||
| 5.00 | 6.6 | 7.3 | 1.0 | ||
| 6.00 | 7.7 | 8.4 | 1.0 | ||
| 6.35 | 8.1 | 8.8 | 1.0 | ||
| 7.94 | 10.1 | 10.7 | 1.6 | ||
| 8.00 | 10.1 | 10.8 | 1.6 | ||
| 9.53 | 11.8 | 12.5 | 1.6 | ||
| 10.00 | 12.3 | 13.0 | 1.6 | ||
| 12.00 | 14.6 | 15.2 | 1.6 | ||
| 14.00 | 17.0 | 17.5 | 2.1 | ||
| 15.88 | 19.1 | 19.6 | 2.1 | ||
| 16.00 | 19.2 | 19.7 | 2.1 | ||
| 18.00 | 21.5 | 22.0 | 2.1 | ||
| Only to choose one from D2 and D3 | |||||
Table C.1 The Label, Type and the Time of Anti-corrosion Steel Tubes for Refrigeration
| Label | Type | The time of anti-corrosion |
| Cu | Copper-coated iron | -- |
| Zn | Galvanized pipe | 48h |
Table C.2 The Conversion Film of Copper Tube on Its Label, Type, Typical Appearance and the Time of Anti-corrosion
| Label | Type | Typical appearance | The time of anti-corrosion |
| A | Bright | Transparent, sometimes with a slight blue light | 6h |
| B | Bleach | Transparent and a little iridescence | 24h |
| C | Iridescence | The iridescence of partial yellow | 72h |
| D | Dark color | Oliver green with brown and bronze | 96h |
| E | Composite | Dark | 200h |
| Note: This table is based on chromate conversion film, the use of other treatment methods can be negotiated by both parties | |||
when the yield phenomenon is not obvious.
