Production method for multi-element alloy steel

A production method and alloy steel technology, applied in metal processing equipment, coating, casting and forming equipment, etc., can solve the problems of metallographic structure, mechanical properties that cannot meet the technical requirements, and product quality that is difficult to pass the acceptance inspection, so as to improve mechanical properties. performance effect

Inactive Publication Date: 2013-02-06
徐宏亮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Mechanical properties of the product: σs is 650~690MPa, Rm is 830~875MPa, low temperature: -45.5℃, a K Can only reach 1J/㎝ 2 Left and right, th

Method used

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  • Production method for multi-element alloy steel
  • Production method for multi-element alloy steel
  • Production method for multi-element alloy steel

Examples

Experimental program
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Embodiment Construction

[0023] The inner tube of the 200-ton electric wheel vehicle is generally made of forgings.

[0024] The invention is produced by centrifugal casting of multi-element alloy steel, and the performance and structure meet the requirements, and the cost is 80% of that produced by the forging process.

[0025] In the design requirements of multi-element alloy steel (ZG30Ni2Cr1MoV), except for Fe element, other chemical components are as follows:

[0026] C: 0.30~0.33%; Si: 0.20~0.35%; Mn: 0.65~0.80%; P≤0.025%; S≤0.025%; Cr: 0.90~1.05%; Ni: 2.15~2.35%; %; V: 0.10-0.15%.

[0027] The main features of the multi-element alloy steel are high strength and sufficient toughness, many types of alloying elements, and a narrow range of requirements.

[0028] The present invention selects centrifugal casting to produce the inner tube, and requires the following controls from aspects such as smelting, casting and heat treatment processes:

[0029] 1. Smelting:

[0030] 1. Smelting equipment:...

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Abstract

The invention discloses a production method for multi-element alloy steel, relating to the technical field of production processes of alloy steel. The production method comprises a smelting step, a centrifugal casting step and a thermal treatment step, wherein the smelting step specifically comprises a melting step, a slagging step, a pre-deoxidation step, a final deoxidizing step and a tapping step. The production method comprises the following implementation steps of: during smelting, adding vanadium iron before final deoxidizing to enable the percentage of V in a product to be 0.10-0.15 percent; during centrifugal casting, taking 103 as a gravity coefficient G in a calculation formula of the rotating speed n of a centrifugal machine; taking a cast coating as a zircon powder water-based coating; when the casting is about to carry out, enabling the temperature of the cast outer wall to be 220DEG C, the casting temperature of molten steel to be 1,520DEG C and the casting speed to be 40kg/s; during pre-deoxidation, respectively inserting 0.75kg of aluminum and 0.75kg of calcium iron silicate in steel of each ton in the furnace; during final deoxidizing, respectively inserting 0.75kg of aluminum and 0.75kg of calcium iron silicate in steel of each ton in the furnace; enabling the tapping temperature to be 1,550-1,570DEG C; and during thermal treatment, normalizing, oil extracting and tempering. According to the production method disclosed by the invention, the mechanical property of an inner tube can be improved and favorable mechanical properties of products, such as yield strength, tensile strength and toughness at low temperature are obtained.

Description

technical field [0001] The invention relates to the technical field of production technology of alloy steel. Background technique [0002] The material of the inner tube of electric wheeled vehicles with high strength and sufficient toughness for conventional production is ZGD650-830. Except for iron, the specific chemical composition of other elements is as follows (%): [0003] C Si mn P S Cr Ni Mo 0.35-0.45 0.20-0.40 1.00-1.80 ≤0.040 ≤0.040 0.80-1.20 1.70-2.30 0.30-0.60 [0004] In the past, the production of alloy steel was smelted by electric arc furnace. During the pre-deoxidation and final deoxidation during the reduction period, 0.50kg of aluminum and 1.0kg of silicon-calcium iron were inserted into the molten pool for each ton of steel, and the tapping temperature was 1560-1580°C. Pouring with a horizontal centrifuge. The mold material is HT20-40, the angle between the two tugboats and the outer circle of the mold is 100°, and the...

Claims

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Application Information

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IPC IPC(8): C22C33/04B22D13/00B22C3/00C21D1/28C21D1/18
Inventor 徐宏亮
Owner 徐宏亮
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