TH25412B - Cold rolled steel - Google Patents

Abstract

DC60 (24/03/43) Long Strip Manufacturing Method Which consists of Continuous casting of all carbon alloy steels to be Long strips no more than 5 mm thick and long strips are rolled in. Later the long strips are loosened and cold rolled, then annealed. To induce stress-releasing micro-structures in it Cold rolling will cause Reduce with the cold. It is sufficient to increase the tensile strength of the strip to at least 680 MPa, but in such a way that the total elongation properties of the long strip after annealing is in the range of 8% to 12%. The thickness reduction occurred. Of cold length strips in the range of 40% to 80% may be chosen to make long strips at Continuously being cast The continuous strips are rolled up in alignment before being rolled in to achieve an initial length reduction in the range of 40% to 60%. Which consists of Continuous casting of all carbon alloy steels to be Long strips no more than 5 mm thick and long strips are rolled in. Later the long strips are loosened and cold rolled, then annealed. To induce stress-releasing micro-structures in it Cold rolling will cause Reduce with the cold. It is sufficient to increase the tensile strength of the strip to at least 680 MPa, but in such a way that the total elongation properties of the long strip after annealing is in the range of 8% to 12%. Produce thickness reduction Of cold length strips in the range of 40% to 80% may be chosen to make long strips at Continuously being cast Sequins are rolled in alignment before being rolled in to achieve an initial length reduction in the range of 40% to 60%.

Claims (8)

1.How to produce steel strips Which consists of continuous casting of all carbon alloy steels into Long strips with a thickness not exceeding 5 mm. Long strip rolls into Loosening the long strip Cold Rolled Long Strips Released and Annealed, Cold Rolled Long Strips. To evoke the obtained microstructure The release of stress in it Where cold rolling will produce a cold reduction during the period which is sufficient for the Increase the tensile strength of the long bar to at least 680 MPa, but the elongation properties The total length of the strips after such baking is in the range of 8% to 12%. 2. Method as stated in claim 1, which is pulling of The length of the strip will be increased to a minimum of 700 MPa. 3. The method specified in claim 1 or claim 2, in which cold rolling will cause Cooling length reduction in the range of 40% to 80% 4. Method as specified in any of Claims 1 to 3, where the baking It will cause a level structure. Strained release microcas with no more than 10% recrystallization and at least 10% elongation properties. 5. Method as stated in claim 4, where temperature in Annealing ranges from 500 ° C to 600 ° C. 6. Method As noted in one of the preceding claims, the long strips are cast. Successively will be ironed 7. The method described in claim 6 is that hot rolling will Causing a reduction in thickness The length of the strip is not more than 40%. 8. Method as specified in claim 6 or claim 7, which the cold rolling process will do. This results in a reduction in the thickness of the long strips in the range of 40% to 60%. 9. The method stated in one of the previous claims in which the strip is cast. Continuously to have Not more than 2 mm before any type of ironing 1 0. Method as specified in claim 9 in which the strip is Continuous casting to a minimum thickness of 1.5 mm prior to any extrusion. And reduced to thickness from 0.4 mm to 1 mm by cold rolling and / or hot rolling 1 1. Method, as specified in any of the previous claims, in which alloy steel Carbon is all made of iron. Neutral containing silicon / manganine Which has the following components: Carbon 0.02 - 0.08% Manganese 0.30 - 0.80% Silicon 0.10 - 0.40% Sulfur 0.005 - 0.05% Aluminum Less than 0.01% 1 2. Method as set out in claim 11, which steel It contains 0.6% manganese and 0.3% silicon by weight 1. 3. All carbon steel bar Which has the final pulling power at They are at least 680 MPa and have elongation in the range of 8% to 12%. 4. The all-carbon alloy steel strip, as described in claim 13, has a It has a minimum value of 700 MPa 1. 5. All-carbon alloy steel strips, as described in claim 13 or claim 14, in thickness range 0.2 mm to 1.0 mm 1. 6. All-carbon alloy steel tab, as described in any Clause 13 to 15. And which has the properties of stretching The one with at least 10% 1 value. 7. All carbon-alloy steel strips as set out in any of Clause 13 to 16, where carbon alloy steels Are all neutralized iron containing silicon / manganese. Which has the following components: Carbon 0.02 - 0.08% Manganese 0.30 - 0.80% Silicon 0.10 - 0.40% Sulfur 0.005 - 0.05% Aluminum Less than 0.01% 1 8. All-carbon alloy steel bar as described in claim 17, where steel It contains 0.6% manganese and 0.3% silicon by weight.