摘要:
The invention relates to a steel strip having a hot dip zinc based coating, the steel strip having the following composition, in weight%,: C: 0.17 - 0.24 Mn:. 1.8 - 2.5 Si: 0.65 - 1.25 Al: ≤ 0.3 optionally: Nb: ≤ 0.1 and/or V: ≤ 0.3 and/or Ti: ≤ 0.15 and/or Cr: ≤ 0.5 and/or Mo: ≤ 0.3, the remainder being iron and unavoidable impurities, with a Si/Mn ratio ≤ 0.5 and a Si/C ratio ≥ 3.0, with an Mn equivalent ME of at most 3.5, wherein ME = Mn + Cr + 2 Mo (in wt.%) having a microstructure with (in vol.%): ferrite: 0 - 40 bainite: 20 - 70 martensite: 7 - 30 retained austenite: 5 - 20 pearlite: ≤ 2 cementite: ≤ 1 having a tensile strength in the range of 960 - 1100 MPa, a yield strength of at least 500 MPa, and a uniform elongation of at least 12%.
摘要:
The invention relates to a steel for hot forming According to the invention the steel for hot forming has the following composition weight%: C: 0.12 - 0.24, Mn: 1.60 - 2.50, Si: ≤ 0.195, Cr: ≤ 0.9, Al: ≤ 1.3, P: ≤ 0.02, S: ≤ 0.005, N: ≤ 0.03, B: ≤ 0.0004, O: ≤ 0.008 and optionally: Ti: ≤ 0.2, Mo: ≤ 0.2, Nb: ≤ 0.2, V: ≤ 0.2, Ca: ≤ 0.05, the remainder being iron and unavoidable impurities. The invention also relates to a strip, sheet or blank produced with such a steel, method for producing a hot formed product, such a product and the use thereof.
摘要:
The invention relates to a high strength low alloy steel. According to the invention the high strength low alloy steel strip, sheet or blank, coated with zinc or a zinc alloy, has the following composition in weight%: C: 0.03 - 0.07, Mn: 0.70 - 1.60, Si: ≤ 0.01 - 0.2, Al: 0.005 - 0.1, Cr: ≤ 0.1, Cu: ≤ 0.2, N: ≤ 0.008, P: ≤ 0.03, S: ≤ 0.025, O: ≤ 0.01, Ti: 0.02 - 0.07, V: 0.04 - 0.15, Mo: ≤ 0.03, Nb: ≤ 0.03, Ca: ≤ 0.05, the remainder being iron and unavoidable impurities, wherein the steel strip, sheet or blank has a yield strength Rp0,2 of at least 420 MPa.
摘要:
The invention relates to a high strength hot dip galvanised complex phase steel strip consisting, in mass percent, of the following elements: 0.13-0.19 %C, 1.70- 2.50 %Mn, max 0.15 % Si, 0.40 - 1.00 % Al, 0.05 - 0.25 % Cr, 0.01 - 0.05 % Nb, max 0.10 % P, max 0.004 % Ca, max 0.05 % S, max 0.007 % N, and optionally at least one of the following elements: max 0.50 % Ti, max 0.40 % V, max 0.50 % Mo, max 0.50 % Ni, max 0.50 % Cu, max 0.005 % B, the balance being Fe and inevitable impurities, wherein 0.40 % 1.90 %, and having a complex phase microstructure, in volume percent, comprising 8-12 % retained austenite, 20 - 50 % bainite, less than 10 % martensite, the remainder being ferrite, as well as to a method of producing the same.
摘要:
The present invention relates to a coated steel substrate suitable for hot-dip galvanising, which comprises a steel strip, sheet or blank substrate containing one or more of Al, Si, Cr and Mn as alloying elements and a metallic flash layer thereon, characterised in that the metallic flash layer comprises: - a first flash layer adjacent to the steel substrate for reducing segregation of the alloying elements, the first flash layer containing one or more of Al, Ag, Au, Cr, Cu, Mo, Ni, Sn and Zr, and - a second flash layer for retaining the first flash layer during hot-dip galvanising, the second flash layer containing Fe as the main constituent.
摘要:
The invention relates to a steel for hot forming According to the invention the steel for hot forming has the following composition in weight%: C: 0.10 - 0.25, Mn: 1.4 - 2.8, Si: ≤ 1.0, Cr: ≤ 1.0, Ti: ≤ 0.05, Nb: ≤ 0.05, V: ≤ 0.1, Mo: ≤ 0.1, Al: ≤ 0.05, P: ≤ 0.02, S: ≤ 0.005, Ca: ≤ 0.005, O: ≤ 0.01, N: ≤ 0.02, B: ≤ 0.0004,
the remainder being iron and unavoidable impurities. The invention also relates to a strip, sheet or blank produced with such a steel, a method for producing a hot formed product, such a product and the use thereof.
摘要:
The invention relates to a high strength hot dip galvanised steel strip consisting, in mass percent, of the following elements: 0.13 - 0.19 % C 1.70 - 2.50 % Mn max 0.15 % Si 0.40 - 1.00 % Al 0.05 - 0.25 % Cr 0.01 - 0.05 % Nb max 0.10 % P max 0.004 % Ca max 0.05 % S max 0.007 % N and optionally at least one of the following elements: max 0.50 % Ti max 0.40 % V max 0.50 % Mo max 0.50 % Ni max 0.50 % Cu max 0.005 % B the balance being Fe and inevitable impurities, wherein 0.40 % 1.90 %. This steel offers improved formability at a high strength, has a good weldability and surface quality together with a good producability and coatability.
摘要:
The invention relates to a. method for manufacturing a coated steel part having very high mechanical properties using hot forming techniques. According to the invention, the method comprises the following steps: • providing a coated steel blank comprising a steel substrate with a coating layer • heating the blank to a temperature of 800° C or more in a furnace • transporting the heated blank from the furnace and placing the blank in a hot forming press • hot forming the blank in the press to form the coated steel part • quenching the coated steel part
wherein the heated blank has a temperature of at most 780° C when placed in the hot forming press. The invention also relates to a hot formed part manufactured using the method according to the invention.