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Our company based on market needs development and production of ultra-high precision steel tubes, mainly cold drawn, cold rolling, honing processing methods, with high precision, stable quality, good price and so on.
The major products are：
一、A variety of standard non-standard ultra-precision hydraulic and pneumatic cylinder:
Inner diameter specifications: Φ30 ~ Φ400mm thickness: 2.5 ~ 25mm
Material: 20 #, 45 #, 16Mn, 37Mn5, 27SiMn
Standard: GB8713-88 hydraulic and pneumatic cylinder with precision diameter seamless steel tubes, GB3639-83 drawn or cold rolled precision seamless steel pipe
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1、Variety in the following table： |
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Processing form |
Bore (mm) |
Length |
Straightness (mm) |
Dimensional accuracy |
Bore roughness (μm) |
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Cold rolling |
30—100 |
≤12m |
0.3～1.0/1000 |
H8～H10 |
0.4～1.6 |
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Cold drawn |
30—400 |
≤10m |
0.8～1.6 |
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Honing |
32—500 |
≤12m |
H8～H9 |
0.4～0.8 |
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2、Cold-drawn and cold-rolled precision steel mechanical properties in the following table： |
|
Cards
Number |
Delivery status |
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Cold processing
/ Hard (Y) |
Cold processing
/ Soft (R) |
Stress Relief
Annealing (T) |
|
σb MPa |
δ5 % |
σb MPa |
δ5 % |
σb MPa |
δ5 % |
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10 |
420 |
6 |
380 |
10 |
340 |
12 |
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20 |
520 |
5 |
460 |
8 |
440 |
10 |
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30 |
600 |
4 |
560 |
6 |
530 |
8 |
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45 |
660 |
4 |
640 |
5 |
620 |
7 |
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3、Cold-drawn and cold-rolled precision steel dimensional tolerances： |
|
Inner diameter dimension (mm) |
Inner diameter deviation (mm) |
Thickness deviation |
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上差 H8 下差 |
上差 H9 下差 |
上差 H10 下差 |
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30 |
+0.033 0 |
+0.052 0 |
+0.084 0 |
±5% |
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＞30—50 |
+0.039 0 |
+0.062 0 |
+0.100 0 |
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＞50—80 |
+0.046 0 |
+0.074 0 |
+0.120 0 |
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＞80—120 |
+0.054 0 |
+0.087 0 |
+0.140 0 |
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＞120—180 |
+0.064 0 |
+0.100 0 |
+0.160 0 |
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＞180—250 |
+0.072 0 |
+0.115 0 |
+0.185 0 |
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＞250—315 |
+0.081 0 |
+0.130 0 |
+0.210 0 |
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＞315—400 |
+0.089 0 |
+0.140 0 |
+0.230 0 |
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Precision pump barrel oil industry pipe supply specifications in the following table： |
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Cylinder Specifications |
Implementation of standards |
Material |
Inner roundness (mm) |
Thickness deviation (mm) |
Roughness (μm) |
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The inner surface |
The outer surface |
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1 1/4″ |
API SPEC11AX |
20/45 |
0.03 |
≤0.3 |
Ra≤0.4～1.6 |
Ra≤3.2 |
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1 1/2″ |
20/45 |
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1 3/4″ |
20/45 |
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2 1/4″ |
20/45 |
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2 3/4″ |
20/45 |
0.035 |
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3 1/4″ |
20/45 |
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3 3/4″ |
20/45 |
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Seamless oil pipe
