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    • 41. 发明申请
    • METHOD FOR MANUFACTURING A HIGH STRENGTH STEEL PRODUCT AND STEEL PRODUCT THEREBY OBTAINED
    • 制造高强度钢产品和获得的钢产品的方法
    • WO2016079675A1
    • 2016-05-26
    • PCT/IB2015/058887
    • 2015-11-17
    • ARCELORMITTAL
    • ARLAZAROV, ArtemZHU, Kangying
    • C21D7/13C21D8/02C23C2/04C23C2/06C21D9/46C21D1/18C22C38/02C22C38/04C22C38/06C22C38/38
    • C21D8/0205C21D1/18C21D7/13C21D8/02C21D8/0226C21D8/0263C21D9/46C21D2211/001C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/38C23C2/06C23C2/12C23C2/28
    • A method for manufacturing a steel product, comprising the steps of: providing a heated steel starting product at a temperature comprised between 380°C and 700°C, having a metastable fully austenitic structure, with a composition comprising, in percent by weight: 0.15% ≤ C ≤ 0.40%,1.5% ≤ Mn ≤ 4.0%, 0.5% ≤ Si ≤ 2.5%, 0.005% ≤ Al ≤ 1.5%, with 0.8% ≤ Si+Al ≤ 2.5%, S ≤ 0.05%, P ≤ 0.1%, at least one element chosen among Cr and Mo, such that: 0% ≤ Cr ≤ 4.0%, 0% ≤ Mo ≤ 0.5%, and 2.7% ≤ Mn + Cr + 3 Mo ≤ 5.7%, and optionally one or several elements chosen among: Nb ≤ 0.1%, Ti ≤ 0.1%, Ni ≤ 3.0%, 0.0005% ≤ B ≤ 0.005%, 0.0005% ≤ Ca ≤ 0.005%, the balance of the composition consisting of iron and unavoidable impurities resulting from the smelting; subjecting said starting product to a hot forming step at a temperature comprised between 700°C and 380°C, with a cumulated strain ε b between 0.1 and 0.7, in at least one location of said heated steel starting product, to obtain a fully austenitic hot-formed steel product; then quenching the hot-formed steel product by cooling it down, at a cooling rate VR 2 superior to the critical martensitic cooling rate, to a quenching temperature QT lower than Ms in order to obtain a structure containing between 40% and 90% of martensite, the rest of the structure being austenite; then maintaining at, or reheating the product up to a holding temperature PT between QT and 470°C and holding it at said temperature PT for a duration Pt between 5s and 600s.
    • 一种制造钢产品的方法,包括以下步骤:在380℃至700℃之间的温度下提供具有亚稳态完全奥氏体结构的加热钢起始产物,其组成包含:以重量百分比计:0.15 %≤C≤0.40%,1.5%≤Mn≤4.0%,0.5%≤Si≤2.5%,0.005%≤Al≤1.5%,0.8%≤Si+Al≤2.5%,S≤0.05%,P≤0.1 %,选自Cr和Mo中的至少一种元素,使得:0%≤Cr≤4.0%,0%≤Mo≤0.5%和2.7%≤Mn+ Cr +3Mo≤5.7%,以及任选的一种或几种 元素选自:Nb≤0.1%,Ti≤0.1%,Ni≤3.0%,0.0005%≤B≤0.005%,0.0005%≤Ca≤0.005%,组成由铁和不可避免的杂质组成的余量 ; 在所述加热的钢起始产物的至少一个位置,使所述起始产物在700℃至380℃之间的温度下,累积应变εb为0.1至0.7的热成型步骤,以获得完全奥氏体热 成型钢产品; 然后通过以比临界马氏体冷却速度高的冷却速度VR2将热成形钢产品冷却至低于Ms的淬火温度QT,以获得含有40%至90%的马氏体的结构, 其余的结构是奥氏体; 然后将产品保持在或重新加热到QT和470℃之间的保持温度PT,并将其在所述温度PT下保持在5秒和600秒之间的持续时间Pt。