RU97121986A

RU97121986A - STEEL FOR THE PRODUCTION OF A STEEL DETAIL BY COLD PLATIC DEFORMATION AND A METHOD OF MANUFACTURING A DETAIL

Info

Publication number: RU97121986A
Application number: RU97121986/02A
Authority: RU
Inventors: Ришар Клод
Original assignee: Аскометаль
Priority date: 1996-12-31
Filing date: 1997-12-26
Publication date: 1999-10-10

Claims

1. Steel for the manufacture of steel parts cold plastic deformation, characterized in that it has the following chemical composition, in wt.%:
0.03% ≤ C ≤ 0, 16%
0.5% ≤ Mn ≤ 2%
0.05% ≤ Si ≤ 0.5%
0% ≤ Cr ≤ 1.8%
0% ≤ Mo ≤ 0.25%
0.001% ≤ Al ≤ 0.05%
0.001% ≤ Ti ≤ 0.05%
0% ≤ V ≤ 0.15%
0.0005% ≤ B ≤ 0.005%
0.004% ≤ N ≤ 0.012%
0.001% ≤ S ≤ 0.09%
if necessary, up to 0.005% calcium, up to 0.01% tellurium, up to 0.04% selenium, up to 0.3% lead, the rest is iron and impurities due to smelting, and the chemical composition of the steel also satisfies the following ratios:
Mn + 0.9 x Cr + 1.3 x Mo + 1.6 x V ≥ 2.2%
and
Al + Ti ≥ 3.5% x N
2. Steel under item 1, characterized in that it has the following chemical composition:
0.06% ≤ C ≤ 0.12%
0.8% ≤ Mn ≤ 1.7%
0.1% ≤ Si ≤ 0.35%
0.1% ≤ Cr ≤ 1.5%
0.07% ≤ Mo ≤ 0.15%
0.001% ≤ Al ≤ 0.035%
0.001% ≤ Ti ≤ 0.03%
0% ≤ V ≤ 0.1%
0.001% ≤ B ≤ 0.004%
0.004% ≤ N ≤ 0.01%
0.001% ≤ S ≤ 0.09%
if necessary, up to 0.005% calcium, up to 0.01% tellurium, up to 0.04% selenium, up to 0.3% lead, the rest is iron and impurities due to smelting.

3. Steel under item 2, characterized in that it has such a chemical composition that:
Ni ≤ 0,25%
Cu ≤ 0,25%
4. Steel under item 2 or 3, characterized in that it has such a chemical composition that:
P ≤ 0.02%
5. A method of manufacturing steel parts cold plastic deformation, characterized in that the semi-finished product is made of steel on PP. 1-4, the semi-finished product is hot-rolled after it is heated to a temperature above 940 ° C and is finished rolling at 900-1050 ° C to produce rolled metal, rolled products are quenched directly from the rolled heating, to obtain, predominantly, a bainite structure, if necessary, in rolled products cut the workpiece and subjected to cold plastic deformation of the workpiece or rolled to obtain a product having a final mechanical characteristics.

6. A method of manufacturing a steel product of cold plastic deformation, characterized in that the semi-finished product is made of steel according to claims. 1-4, the semi-finished product is hot rolled to produce rolled products, rolled products are quenched after they are heated above the AC ₃ point to obtain a predominantly bainitic structure, if necessary, a billet is cut out at the rolled products and a cold-deformed billet is subjected to cold plastic deformation to produce a product having final mechanical characteristics.

7. A method of manufacturing a steel product with cold plastic deformation, characterized in that the semi-finished product is made of steel according to claims. 1-4, the semi-finished product is hot rolled to produce rolled products, if necessary, a billet is cut out at the rolled products, cold plastic deformation of the billet or rolled products is carried out to obtain a product, and the product is subjected to quenching after it is heated above the AC ₃ point to obtain, predominantly, a bainite structure and final mechanical characteristics.

8. Steel product obtained by cold deformation, characterized in that it consists of steel according to any one of paragraphs. 1-4, in which the narrowing of Z became higher than 45%, and the temporary tensile resistance Rm is higher than 650 MPa.

9. The product according to claim. 8, characterized in that the temporary resistance to tensile steel above 1200 MPa.

10. The product according to claim 8 or 9, characterized in that it has a mainly bainitic structure.

11. Hot rolled steel, characterized in that it consists of steel according to any one of paragraphs. 1-4 and has a predominantly bainitic structure.