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A production process of wear-resistant steel nm400e medium plate

A production process and wear-resistant steel technology, applied in the field of medium and heavy plate production, which can solve the problems of high strength, hardness, low temperature impact performance, looseness, and easy segregation.

Active Publication Date: 2014-10-08
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the large amount of NM400E alloy added, the steel plate is prone to defects such as segregation and porosity, and the steel has high requirements for strength, hardness, and low-temperature impact performance, so its production is difficult

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  • A production process of wear-resistant steel nm400e medium plate

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Embodiment Construction

[0010] The invention adopts converter smelting, mold casting and pouring, and 3800m wide and thick plate rolling mill to produce NM400E wear-resistant steel plate; its technological process is: high-quality molten iron, KR molten iron pretreatment, 100 / 120 tons of top and bottom combined blowing converter, LF furnace refining , vacuum degassing treatment, slab cooling for 24-60 hours, pusher type heating furnace, 3800m rolling mill, ACC laminar cooling, 11-roll hot straightening machine, stack cooling, finishing, annealing, external inspection, flaw detection, entry library.

[0011] The NM400E steel plate with a medium thickness of 30-40 mm in the present invention contains the following chemical components in mass percentage (unit, wt%): Composition design: C: 0.16-0.19, Si: 0.20-0.40, Mn: 1.25-1.35, P: ≤ 0.015, S: ≤0.005, Cr: 0.20~0.30, Mo: 0.20~0.30, V: 0.04~0.06, Nb: 0.17~0.03, Ti: 0.17~0.26, Ni: 0.25~0.35, Als: 0.20~0.40, others For Fe and residual elements.

[0012] K...

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Abstract

The invention discloses a production process of a wear-resistant steel NM400E medium-thick plate. The production method adopted in the present invention includes process control such as converter smelting, LF refining, vacuum refining, pouring, slab heating, rolling, slow cooling, and heat treatment. Through reasonable chemical composition design and LF+VD process to ensure the cleanliness of steel, and through effective implementation of heating, rolling and quenching and tempering processes, 30mm ~ 40mm high-strength NM400E steel has been successfully developed, and its yield strength The tensile strength is controlled at 1000-1100MPa, the tensile strength is controlled at 1200-1300MPa; the elongation is controlled at 13%-17%; the V-type impact energy at -40°C is controlled at 60-80J; the Brinell hardness in the high-temperature tempering state is 380-420.

Description

technical field [0001] The invention belongs to the technical field of plate production, and in particular relates to a production process of wear-resistant steel NM400E medium plate. Background technique [0002] Wear-resistant steel NM400E has high strength, hardness and toughness, and good cutting performance. It is mainly used for wear-resistant structural parts such as bucket main blade plates and drill bits of large excavators, loaders, and rotary drilling rigs. Since the steel plate with a large amount of NM400E alloy is prone to defects such as segregation and porosity, and the steel has high requirements for strength, hardness, and low-temperature impact performance, its production is difficult. Contents of the invention [0003] Aiming at the above problems, the inventor obtained a production method of wear-resistant steel NM400E plate with a thickness of 30 mm to 40 mm through groping, thereby completing the present invention. [0004] Therefore, the object of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50C21D8/02
Inventor 朱书成许少普李亮亮康文举唐郑磊袁永旗于飒王新
Owner NANYANG HANYE SPECIAL STEEL CO LTD