Ultra-strength and high toughness maraging steel and manufacturing method thereof

A maraging steel, ultra-high-strength technology, applied in the field of steel materials, can solve the problems of low yield strength and plastic toughness, and achieve the effect of low cost

Active Publication Date: 2010-02-17
宝武特种冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN101100728A relates to a nickel-saving type cobalt-free maraging super high strength steel, which contains chromium 3.75-5.25wt%, nickel 11.5-14

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Smelting: vacuum induction furnace smelting + vacuum consumable furnace remelting

[0034] (1) Smelt and pour Φ290mm electrodes in a 6-ton vacuum induction furnace according to the chemical composition shown in Table 1:

[0035] Put pure iron, metal material NiMoCo, etc. into the crucible, preheat the material in the crucible with 250kw, when the vacuum degree is ≤2.7pa, high-power melting, melting power 500-600kw, control the vacuum degree ≤6Pa during the melting period. After full melting, heat up with a high power of 1000kw. After 10 minutes, lower it to 250kw for heat preservation, and start high-temperature refining. The temperature is controlled at 1580-1600°C for carbon-oxygen reaction-decarburization. Take a sample from the furnace and adjust its composition Ni, Mo, Add Al and Ti to melt and stir for 10 minutes, continue high-temperature refining, then reduce to 250kw for heat preservation, continue high-temperature refining after taking samples from the furn...

Embodiment 2-6

[0051] Except that the melting power of the vacuum induction furnace is 500-550kw, the electrified pouring Φ520mm electrode, the consumable crystallizer Φ610mm, and the average melting rate of the vacuum consumable furnace remelting Φ610mm steel ingot is 5kg / min, the rest of the operations are the same as in Example 1.

Embodiment 7-8

[0053] Except that the melting power of vacuum induction furnace smelting is 800kw, the electrified pouring Φ520mm electrode, the consumable crystallizer Φ610mm, and the average melting speed of vacuum consumable furnace remelting Φ610mm steel ingot is 5kg / min, the rest of the operations are the same as in Example 1.

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Abstract

The invention provides ultra-strength and high toughness maraging steel and manufacturing method thereof. The maraging steel comprises the following chemical components: less than or equal to 0.03 weight percent of C, less than or equal to 0.10 weight percent of Mn, less than or equal to 0.10 weight percent of Si, less than or equal to 0.05 weight percent of S, less than 0.010 weight percent of P,17.50 to 20.50 weight percent of Ni, 2.00 to 4.00 weight percent of Mo, 1.00 to 1.75 weight percent of Ti, 0.05 to 0.15 weight percent of Al, 0.0005 to 0.002 weight percent of B, 0.005 to 0.10 weightpercent of Zr+Ca, and the balance of Fe and inevitable impurities. By adopting Ni-Mo-Ti-Al alloying, the maraging steel meets the requirements of good comprehensive properties such as high strength and toughness, which is suitable for high-end products such as thin-wall parts, high-grade moulds and springs.

Description

technical field [0001] The invention relates to iron and steel materials, in particular, the invention relates to ultra-high-strength steel for engineering materials, and more specifically, the invention relates to an ultra-high-strength, high-toughness maraging steel and a manufacturing method thereof. Background technique [0002] In engineering materials, σ 0.2 Steel grades ≥1400Mpa are called ultra-high-strength steels. Ultra-high-strength steel mainly includes low-alloy ultra-high-strength steel, maraging steel and secondary hardening steel. At present, the development and application of maraging steel have been greatly developed. Since its yield ratio is greater than 0.95, δ, ψ, A k 、K 1C Higher than low-alloy structural steel, strong crack propagation ability, high temperature strength, high notch strength, high elastic modulus, good stress corrosion resistance, simple heat treatment process, no decarburization problem, stable size and small deformation during heat...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C33/04
Inventor 张景海赵肃武顾雄陈新建刘忠国陈杰郭军霞
Owner 宝武特种冶金有限公司
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