Silver bright steel It is also called silver steel branch, commonly known as bright round bar or smooth circle. It refers to the round steel with bright surface without rolling defects and decarburization layer. All kinds of steel, carbon steel, easy cutting steel, bearing steel, tool steel, stainless steel, valve steel, etc., can be processed into silver bright steel.
What is silver bright steel?
Classification method
Contents [hide]
1 Classification method
1.1 Flake steel
1.2 Polish steel
1.3 Buff steel
1.3.1 What is drawing?
2 Application of silver bright steel
3 Instructions for ordering (GB/T 3207-2008)
3.1 Straightness and roughness regulations
3.2 Tolerance table
According to different processing methods, silver bright steel can be divided into peeling material, polishing material and polishing material.
Flake steel
Round steel straightened after removing rolling defects and decarburized layer by turning and peeling.
Polish steel
Round steel that is polished after drawing or peeling.
Buff steel
Round steel which is polished after drawing, turning, peeling or polishing.
What is drawing?
Drawing is a method of plastic deformation of steel at room temperature. It can be divided into cold-drawing and pinching-out according to different processes.
Cold-drawing: the method of applying tension at both ends of a metal material to produce tensile deformation.
Pinching-out: a method of deforming the material through a die hole by applying a pulling force at one end of the material. The diameter of the die should be smaller than the diameter of the material. Pinching-out can also produce profiles other than round bar, and the final product is usually obtained after several passes of pinching-out.
Application of silver bright steel
Hot rolled steel annealed into silver bright steel has the advantages of high dimensional accuracy and good surface quality, especially the peeled and polished materials are effectively removed from the surface decarburized layer, surface cracks and various external defects, which can be directly used, save working hours and reduce tool loss. Therefore, it is widely used in machinery and equipment manufacturing, electronics, petroleum, chemical, automobile, railway and manufacturing Shipbuilding, aerospace, nuclear power and other industries.
Instructions for ordering (GB/T 3207-2008)
In addition to the conventional materials and specifications, yinliang steel orders usually have diameter tolerance (tolerance), straightness (straightness) and surface roughness requirements.
Straightness and roughness regulations
Delivery status
Code name
Straightness
Roughness Ra
Peeling
SF
≤1mm/m
≤3.0μm
polish
SP
≤2mm/m
≤5.0μm
polishing
SB
≤1mm/m
≤0.6μm
Tolerance table
Nominal diameter
h7
h8
h9
h10
h11
1.0~3.0
0
-0.010
0
-0.014
0
-0.025
0
-0.040
0
-0.060
＞3.0~6.0
0
-0.012
0
-0.018
0
-0.030
0
-0.048
0
-0.075
＞6.0~10.0
0
-0.015
0
-0.022
0
-0.036
0
-0.058
0
-0.090
＞10.0~18.0
0
-0.018
0
-0.027
0
-0.043
0
-0.070
0
-0.11
＞18.0~30.0
0
-0.021
0
-0.033
0
-0.052
0
-0.084
0
-0.13
＞30.0~50.0
0
-0.025
0
-0.039
0
-0.062
0
-0.100
0
-0.16
＞50.0~80.0
0
-0.030
0
-0.046
0
-0.074
0
-0.12
0
-0.19
＞80.0~120
0
-0.035
0
-0.054
0
-0.087
0
-0.14
0
-0.22
＞120~180
0
-0.040
0
-0.063
0
-0.100
0
-0.16
0
-0.25
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