What are the requirements for carbon structural steel hot-rolled steel belt technology?

The width of 50 - 300 mm, thickness is 2 - 6 mm carbon structural steel hot-rolled steel technical conditions should comply with the GB3524 - with products The provisions of the 92 standard. Production should comply with the mechanical properties and chemical composition of the strip GB700 - 88 'carbon structural steel' regulation. Steel belt should fold flat or rolls, the delivery of the goods. Steel belt size and surface shall meet the following requirements: ( 1) The strip thickness and width deviation should be allowed to meet in table 4 The provisions of 1. ( 2) The strip thickness should be uniform. In the same cross section thickness measurement on both sides of the middle section and part of the three points, its biggest difference ( 3) Shall conform to table 4 The provisions of the two. Steel belt rocker, per meter is not more than 6 mm, total rocker not greater than the total length of 0. 6%. For cold rolled billet steel band, the thickness should be uniform along the rolling direction, in a straight line at any determination of the thickness of the two, the biggest difference ( With poor) Should be followed: the strip width & le; Article 150 mm with the difference is not greater than zero. Article 20 mm > 150 mm with the difference is not greater than zero. 25毫米( 3) The thickness of 2. 0 - 4. 0 mm steel band, its length should not be less than 6 m. Allow delivery length not less than 4 m steel band, but the amount shall not be greater than the number of 8% of the total quality of delivery. Thickness is greater than 4. 0 - 6. 0 mm steel band, its length should not be less than 4 m. Allow delivery of steel belt length not less than 3 m, but the amount shall not be greater than the number of 8% of the total quality of delivery. ( 4) Steel strip surface should be smooth, can not have crack, folding, lamination, porosity and non-metal inclusion, coarse burrs and scale layer, allows for depth or height not allowable deviation is greater than the thickness of the half, Highly correct deviation, depth refers to the negative deviation) Local small pits, scratches, pitting, bump and depth is not greater than zero. The erythema of 8 mm. Allows removal of the surface of the steel belt and lateral defects, thickness and width is not more than the same cross section removal depth to allow negative deviation. Steel strip profile may not have cracked edges, allowing a slight burrs, the depth is not more than 1/5 of the width to allow negative deviation.