This standard applies to high-quality carbon structural steel cold-rolled strip. This product is used to manufacture machine parts, structural parts and other products. GB 3522-1983 High-quality carbon structural steel cold-rolled strip GB3522-1983 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Cold rolled quality carbon structural steel stripsUDC669.14.018
.29-418
GB3522—83
This standard is applicable to cold rolled quality carbon structural steel strips. The product is used to manufacture machine parts, structural parts and other products. 1 Classification and code
1.1 Classification by manufacturing accuracy
Steel strips with ordinary accuracy
Steel strips with high width accuracy
Steel strips with high thickness accuracy
Steel strips with high thickness accuracy
Steel strips with high width and thickness accuracy
1.2 Classification by surface quality
Group I steel strips
Group II steel strips
1.3 Classification by edge status
Trimmed steel strips
Untrimmed steel strips
1.4 Classification by material status
Cold-hardened steel strips
Annealed steel strips
2 Dimensions and appearance
2.1 The dimensions of steel strips and their allowable deviations shall comply with the provisions of Table 1. Released by the National Bureau of Standards on 1983-03-05
Implemented on 1983-12-01
0, 10 ~ 0. 15
, 15 - 0. 25
(, 25 -n.d0
>0. 40 ~0.50
0.50~n.70
20, 70 ~0,95
>0. 95 -1.00
1.00 ~1.35
>[.35 ~1.75
1.75 ~ 2. 30
2.30 ~3.00
3.0n ~4.0m
Normal precision
1,13(1
Higher precision
-0,100
GB3522—83
Allowable deviation
Ordinary precision
Higher precision
Uncut steel
2.2 By mutual agreement, other specifications of steel strips other than those in Table 1 may be supplied. The total size allowable deviation shall be agreed upon by both parties. 2.3 The tolerance of the steel strip shall comply with the provisions of Table 2. Table 2
Steel strip State
: · 50~100www.bzxz.net
100～150
Not set, not more than
CB3522—B3
2.4 The bend of the edge-cut steel strip shall meet the following requirements: for steel strips with a width not exceeding 50mm, the bend shall not exceed 3mm per meter; for steel strips with a width exceeding 50mm, the bend shall not exceed 10mm per meter. The bend of the uncut steel strip may be specified by agreement between the two parties. 2.5 The length of the steel strip shall not be less than 6 m. However, the delivery of steel strips with a length not less than 3m is allowed, and the quantity shall not exceed 10% of the batch weight.
2.6 Marking examples are as follows:
Made of No. 15 steel, ordinary precision, 1 group, trimmed, cold hardened. Original 1mm and 50mm wide steel strip, its mark is: Steel Strip 15-PIQ·Y-1×50-GB3522—833 Technical Requirements
8.1 The steel strip is rolled from No. 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70 steel. Its chemical composition shall comply with GR699—65 "High-quality Carbon Structural Steel Grades and One Yin Technology" 3.2 The steel strip shall be delivered in coils. The inner diameter of the cold-hardened steel strip and the annealed steel strip with a thickness of not less than 0.3mm shall not be less than 150mm; the inner diameter of the annealed steel strip with a thickness greater than 0.3mm shall not be less than 200mml. With the agreement of both parties, steel strip with a thickness of not less than -1mm can be delivered in straight strips. Its length is 2~3㎡, and shorter steel strips with a length of not less than 1m are allowed to be delivered, but their quantity shall not exceed 10% of a batch weight. 3.3 The mechanical properties of the steel strip shall be in accordance with the provisions of Table 3. Table 3
Cold-hardened steel strip (Y)
Tensile strength9
kgf/mm
45 ~80
50 ~ 85
65 ~ 95
65 ~95
65~100
70~105
75-110
75~110
75~115
75~115
Tensile strength 0.
kg/etrum?
32 ~ 56
10 ~60
40 - 65
45 ~ 70
45 ~ 75
45 ~73
45 ~75
45 ~ 75
Strip (T)
Sticky rate 6%
Not less"
GB3522—83
3.3.1 For annealed steel strip with a thickness not exceeding 0.2mm, its elongation index is not used as a delivery condition. 3.4 According to the requirements of the purchaser, the annealed steel strip rolled from 15~50 steel can withstand a 180° bend test perpendicular to the rolling direction of the steel or a 90° bend test halfway to the rolling direction of the steel. During the cold sound test, a pad with the same thickness as the steel strip should be used, and there should be no cracks or delamination at the bend.
3.5 Steel strips made by rolling 35-70 steel strips should be inspected for decarburization. The total decarburization (full decarburization and partial decarburization layer) should meet the requirements of equipment 4.
Carbon content
3.6 The surface of the steel strip of group 1 should be smooth. There should be no cracks, scars, foreign inclusions, scale, rust and delamination. Individual small bumps, concave blocks, scratches and indentation points with a depth or height not exceeding half of the allowable deviation of the steel strip thickness are allowed. 3.7 The surface of the steel strip of group 3 may be oxidized. There should be no cracks, scars, foreign inclusions, scale, rust and delamination. Individual small bumps, blocks, scratches, indentation points with a depth or height not exceeding the allowable deviation of the steel strip thickness are allowed, as well as insignificant corrugations and grooves.
3. On the edge of the trimmed steel strip, there shall be a burr with a depth not exceeding half of the allowable deviation of the steel strip width and a burr not exceeding the allowable deviation of the thickness.
3.9 On the edge of the uncut steel strip, there shall be a crack with a depth not exceeding the allowable deviation of the steel strip width. 3.10 Special requirements for special purpose steel strips (microstructure, decarburization layer depth, mechanical properties, unevenness and finish, etc.) shall be stipulated by agreement between the two parties.
4 Test method
4.1 The surface quality of the steel strip shall be checked with a shoe. 4.2 The size of the steel strip shall be measured at any part of the length direction with a test of corresponding accuracy. For trimmed steel strips with a width greater than 20mm, the thickness shall be measured at a distance of not less than 5mm from the edge; for untrimmed steel strips, the thickness shall be measured at a distance of not less than 10mm from the edge. For steel strips with a width of not more than 20mm, the thickness shall be measured at the center of the width. 4.3. When measuring the bending of the sensitive belt, put the tested part of the steel belt on a flat surface, and use a 1m long ruler to touch the edge of the steel belt to measure the maximum distance between the steel belt and the ruler. When measuring the unevenness, use the interpolation method to measure the maximum height from half of the surface. 4.4 The tensile test of the sensitive belt shall be carried out in accordance with GB228-76 (Metal Tensile Test Method). 4.4.1 The shape and size of the sample for the tensile test shall comply with the provisions of the following figure and Table 5. 15
0. 05 ~ 0. 18
0.20 ~0.50
0.55 ~1.50
1,55 ~2.00
GB3522-83
Test width
The difference between the width of the test specimen and the test length is 1U.25
4.4.2 When the steel strip with a width less than 115mm and the steel strip with a thickness less than 0.18m and a width less than 25mm is subjected to tensile test, a test strip with a width equal to the thickness of the test strip shall be adopted. In this case, the maximum length shall not be measured. 4.4.3 The tensile test specimen shall be cut parallel to the rolling direction. 4.4.4 During the tensile test, the breaking position of the specimen shall be within 1/3 of the center of the gauge length of the specimen to be valid. Otherwise, the test strip shall be cut parallel to the rolling direction. Another sample should be taken for retest.
4.4.5 Calculate the strength according to the actual cross section of the sample before the test. 4.5 The bending test shall be carried out in accordance with GB232-82 "Method for Metal Bending Test". 4.6 The decarburization layer depth test shall be carried out in accordance with GB224-78 "Determination of Decarburization Layer Depth of Steel". 5 Inspection Rules
5.1 The steel strips shall be inspected in batches. Each batch shall consist of a group of steels with the same steel grade, the same furnace number, the same size and the same category. 5.2 The chemical composition of the steel shall be filled in the quality certificate according to the results of the smelting analysis. The chemical composition of the finished steel strips can be inspected according to the requirements of the purchaser. 5.3 All steel strips shall be inspected for appearance and dimensions. 5.4 The unevenness of the steel strips shall be inspected in a cold hard state. 5.5 From the steel strips that have passed the appearance and dimension inspection, select 3% but not less than 10 rolls (bundles) for tensile test, bending test and decarburization depth test of the steel strips.
When conducting each inspection, take a sample from the inner and outer ends of each steel strip, or take a sample from each of the two steel strips selected from each bundle.
5.6 The sampling position of the sample shall be not less than 10mm from the edge for uncut steel strips and not less than 5mm from the edge for cut steel strips. 5.7 The re-inspection regulations of steel strips shall be implemented in accordance with GB247-80 "General Regulations for Inspection, Correction, Packaging, Marking and Quality Certificate of Steel Plates and Steel Strips".
6 Packaging, Marking and Quality Certificate
The packaging, marking and quality certificate of steel strips shall be implemented in accordance with GB247--80. Additional notes:
This standard was proposed by the Ministry of Metallurgical Industry of the People's Republic of China. This standard was drafted by Dalian Steel.
The main drafter of this standard is Yu Yingzhi.
From the date of implementation of this standard, the former Ministry of Metallurgical Industry Standard YB207-65 "Carbon Structural Steel Cold-rolled Strip" will be invalid.
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