HEAT TREATED COLD ROLLED STEEL SHEET AND A METHOD OF MANUFACTURING THEREOF

    公开(公告)号:WO2022009032A1

    公开(公告)日:2022-01-13

    申请号:PCT/IB2021/055898

    申请日:2021-07-01

    申请人: ARCELORMITTAL

    摘要: A cold rolled steel sheet having a composition comprising of 0.05 % ≤ Carbon ≤ 0.15 %, 1.8% ≤ Manganese ≤ 2.7%, 0.1% ≤ Silicon ≤ 1%,0.01% ≤ Aluminum ≤ 0.8%,0.1% ≤ Chromium ≤ 0.9%,0% ≤ Phosphorus ≤ 0.09%,0.0001% ≤ Titanium ≤ 0.1%,0.0005% ≤ Boron ≤ 0.003%, 0.01% ≤ Niobium ≤ 0.1%, 0 % ≤ Sulfur ≤ 0.09 %, 0 % ≤ Nitrogen ≤ 0.09%, 0% ≤ Vanadium ≤ 0.2%, 0%≤Molybdenum ≤0.2%, 0%≤ Nickel ≤2%, 0% ≤ Copper ≤ 2%, 0% ≤ Calcium ≤ 0.005%, 0% ≤ Cerium ≤ 0.1%, 0% ≤ Magnesium ≦ 0.05%, 0% ≤ Zirconium ≦ 0.05%, the remainder being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet comprising in area fraction, 40% to 60% martensite, 15 to 40% of inter-critical ferrite, a cumulated amount of 10 to 35% of transformed ferrite and bainite and 0% to 5% of residual austenite.

    以油或油气氛作为冷却介质的等温淬火工艺

    公开(公告)号:WO2021114394A1

    公开(公告)日:2021-06-17

    申请号:PCT/CN2019/127808

    申请日:2019-12-24

    申请人: 王宁

    发明人: 王宁 WANG, Ning

    IPC分类号: C21D1/20 C21D1/58 C21D1/613

    摘要: 一种以油介质降温并以油或气体介质等温淬火的工艺(SFPID),将热处理对象连续完成加热工序及淬火工序;淬火过程在无氧环境下的油介质中进行;其步骤包括:S1.在设备中将热处理对象加热并使其奥氏体化;S2.在油介质中将奥氏体化的热处理对象快速冷却至下贝氏体区;S3.在油介质中对下贝氏体化的热处理对象等温处理并获得下贝氏体组织;S4.对完成淬火过程的热处理对象进行清洗。采用油并使用能隔绝油与空气(氧气)的设备(SFPID专用炉)使油接触不到氧气,可以防止油品因温度过高起火燃烧或老化。

    一种高强度曲轴的制造方法
    3.
    发明申请

    公开(公告)号:WO2019223491A1

    公开(公告)日:2019-11-28

    申请号:PCT/CN2019/084409

    申请日:2019-04-25

    发明人: 殷文元 钱祥鑫

    摘要: 本发明提供的一种高强度曲轴的生产方法,将成型后的曲轴投入流态床粒子炉中升温到900℃,进行奥氏体化,温度偏差为±5℃,奥氏体化时间为30~180min;向炉中通入氨气,在氨气的保护下,对奥氏体不锈钢工件进行氮碳共渗处理形成渗层;然后在流态床粒子炉中250-360℃等温淬火。本发明方法在与奥氏体氮碳共渗的同时,通入氩气进行高温气体氮碳共渗。持续通入的氩气降低了氧化性气氛,可以根除产生氢氰酸的根源,用来代替铁素体氮碳共渗,不仅根除氢氰酸地污染,还能提高有效硬化层的深度。氩气的通入同时提高了工件的硬度和耐蚀性,并且本发明的工艺具有处理速度快,工艺简单的特点,适合于大规模推广使用。

    ZINC COATED STEEL SHEET WITH HIGH RESISTANCE SPOT WELDABILITY

    公开(公告)号:WO2018234839A1

    公开(公告)日:2018-12-27

    申请号:PCT/IB2017/000753

    申请日:2017-06-20

    申请人: ARCELORMITTAL

    摘要: A method for producing a zinc or zinc-alloy coated steel sheet with a tensile strength higher than 900 MPa, for the fabrication of resistance spot welds containing in average not more than two Liquid Metal Embrittlement cracks per weld having a depth of 100μιη or more, comprising the successive steps of providing a cold-rolled steel sheet, the nominal composition of which contains, in weight percent: 0.07% ≤ C ≤ 0.5%, 0.3% ≤ Mn ≤ 5%, 0.010% ≤ Al ≤1 %, 0.010% ≤ Si ≤ 2.45%, with 0.35% ≤ (Si+AI) ≤ 2.5%,, 0.001 % ≤ Cr ≤ 1.0%, 0.001 % ≤ Mo ≤ 0.5%, and optionally, 0.005% ≤ Nb ≤0.1 %, 0.005% ≤ V ≤ 0.2%, 0.005% ≤ Ti ≤ 0.1 %, 0.0001 % ≤ B ≤ 0.004%, 0.001 % ≤ Cu ≤ 0.5%, 0.001 % ≤ Ni ≤ 1.0%, the remainder being iron and unavoidable impurities from the smelting, heating said cold-rolled steel sheet up to a temperature T1 comprised between 550°C and Ac1 +50°C in a furnace zone with an atmosphere (A1) containing from 2 to 15% hydrogen by volume, the balance being nitrogen and unavoidable impurities, so that the iron is not oxidized, then adding in the furnace atmosphere at least one element selected from liquid water, water steam or oxygen at a temperature T≥T1, so to obtain an atmosphere (A2) with a dew point comprised between 15°C and the temperature Te of the iron/iron oxide equilibrium dew point, then heating the sheet from said temperature T 1 up to a temperature T 2 comprised between 720°C and 1000°C in a furnace zone under an atmosphere (A2) of nitrogen containing from 2 to 15% hydrogen and more than 0.1 % CO by volume, then soaking the sheet at T 2 , then cooling the sheet, then coating the sheet with zinc or zinc-alloy coating.

    METHOD FOR MANUFACTURING SPHEROIDAL CAST IRON MECHANICAL COMPONENTS
    9.
    发明申请
    METHOD FOR MANUFACTURING SPHEROIDAL CAST IRON MECHANICAL COMPONENTS 审中-公开
    制造机组铸铁机械组件的方法

    公开(公告)号:WO2008003395A8

    公开(公告)日:2008-04-17

    申请号:PCT/EP2007005333

    申请日:2007-06-18

    摘要: A method for manufacturing mechanical components made of spheroidal cast iron, comprising the following steps: - providing a casting of a mechanical component made of cast iron having a structure which is at least partially ferritic and has a carbon content ranging from 2.5% to 4.0% and a silicon content ranging from 2.0% to 3.5%; - bringing the cast iron casting having an at least partially ferritic structure to a temperature for partial austenitizing which is higher than the lower limit austenitizing temperature (Ac1) and lower than the upper limit austenitizing temperature (Ac3) for a time required to obtain an at least partially austenitic structure; - performing a thermal treatment for isothermal hardening at a temperature ranging from 250°C to 400°C in order to obtain a matrix which has at least partially a pearlitic-ferritic or perferritic structure.

    摘要翻译: 一种用于制造由球墨铸铁制成的机械部件的方法,包括以下步骤:提供具有至少部分铁素体并且碳含量为2.5%至4.0%的结构的由铸铁制成的机械部件的铸件, 硅含量范围为2.0%〜3.5%; - 将具有至少部分铁素体结构的铸铁铸件的部分奥氏体化温度高于下限奥氏体化温度(Ac1)并低于上限奥氏体化温度(Ac3)达到所需时间 最小部分奥氏体结构; - 在250℃至400℃的温度下进行等温硬化的热处理,以获得至少部分具有珠光体 - 铁素体或非铁酸盐结构的基体。

    METHOD FOR MANUFACTURING SPHEROIDAL CAST IRON MECHANICAL COMPONENTS
    10.
    发明申请
    METHOD FOR MANUFACTURING SPHEROIDAL CAST IRON MECHANICAL COMPONENTS 审中-公开
    制造机组铸铁机械组件的方法

    公开(公告)号:WO2008003395A3

    公开(公告)日:2008-02-28

    申请号:PCT/EP2007005333

    申请日:2007-06-18

    摘要: A method for manufacturing mechanical components made of spheroidal cast iron, comprising the following steps: - providing a casting of a mechanical component made of cast iron having a structure which is at least partially ferritic and has a carbon content ranging from 2.5% to 4.0% and a silicon content ranging from 2.0% to 3.5%; - bringing the cast iron casting having an at least partially ferritic structure to a temperature for partial austenitizing which is higher than the lower limit austenitizing temperature (AcI) and lower than the upper limit austenitizing temperature (Ac3) for a time required to obtain an at least partially austenitic structure; - performing a thermal treatment for isothermal hardening at a temperature ranging from 250°C to 400°C in order to obtain a matrix which has at least partially a pearlitic-ferritic or perferritic structure.

    摘要翻译: 一种用于制造由球墨铸铁制成的机械部件的方法,包括以下步骤:提供具有至少部分铁素体并且碳含量为2.5%至4.0%的结构的由铸铁制成的机械部件的铸件, 硅含量范围为2.0%〜3.5%; - 将具有至少部分铁素体结构的铸铁铸件的部分奥氏体化温度高于下限奥氏体化温度(AcI)并低于上限奥氏体化温度(Ac3)达到所需时间 最小部分奥氏体结构; - 在250℃至400℃的温度下进行等温硬化的热处理,以获得至少部分具有珠光体 - 铁素体或非铁酸盐结构的基体。