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Method for producing CrMnNiMo series ultra-thick mold compound billets

A production method and technology for composite blanks are applied in the production field of CrMnNiMo series extra-thick mold composite blanks, which can solve problems such as unstable flow rate and welding cracking, and achieve the effects of low production cost, reduced production pressure and high efficiency.

Active Publication Date: 2016-01-20
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a welding and heating method for mold steel composite billet produced by using continuous casting billet as the basic raw material, which can effectively solve the problem of unstable velocity and flow caused by low temperature magnetism of die steel and the welding caused by the characteristics of the steel type. Problems of cracking, warping and hereditary problems of cracking in the welding process, and effectively improve production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Steel type: 718, the composition is shown in Table 1, and the thickness of the billet is 492mm.

[0028] Table 1 Embodiment 1 blank chemical composition

[0029] element C Si mn Mo Cr Ni Content wt% 0.35 0.40 0.92 0.51 1.80 1.08

[0030] The mother billet is made of high-quality continuous casting billet, the long side is 4500mm, the short side is 1650mm, the thickness of the billet is 492mm, L 长 / L 短 =2.727.

[0031] The six sides of the steel billet are milled, especially for the composite interface, after rough milling to grind fresh metal, continue to finish milling 0.7mm, the surface roughness of the composite interface is controlled at Ra=6.4μm, after cleaning the billet, measure the magnetic field strength of the steel type as 2.4T, enter the vacuum chamber to evacuate and stack in parallel, ready for welding.

[0032] The welding sequence is spot welding and continuous welding. Choose vacuum chamber welding atmosphere 320±1...

Embodiment 2

[0042] Steel type: 2738, billet thickness H=296mm

[0043] Table 2 embodiment 2 billet chemical composition

[0044] element C Si mn Mo Cr Ni Content wt% 0.42 0.60 1.56 0.35 2.10 1.20

[0045] The mother billet is made of high-quality continuous casting billet, the long side is 4000mm, the short side is 1450mm, the thickness of the finished billet is 296mm, and L length / L short=2.758.

[0046] All six sides of the billet are milled, especially for the composite interface, after rough milling to grind fresh metal, continue to finish milling 0.5mm, the surface roughness of the composite interface is controlled at Ra=3.2μm, after cleaning the billet, measure the magnetic field strength of the steel For 2.56T, enter the vacuum chamber to evacuate and stack them in parallel, ready for welding.

[0047] The welding sequence is spot welding and continuous welding. Choose a vacuum chamber welding atmosphere of 300±10°C.

[0048] Among them, the sp...

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Abstract

Disclosed is a method for producing CrMnNiMo series ultra-thick mold compound billets. The ratio from long side to short side of a continuous cast billet is larger than or equal to 2.5; a milling machine is used for machining six surfaces of a billet, and the compound interface Ra is equal to 3-6 [mu]m; the billet is subjected to spot welding and then continuous welding at the atmosphere of 100-500 DEG C after being subjected to vacuum treatment; the welding current is 50-180 mA, and the speed is 220-350 mm / min; the billet enters a thermal treatment furnace within one hour after being welded to be subjected to medium-temperature tempering or annealing of 0.5-1 min / mm; as for a compound billet which is 100-300 mm in thickness, a stepwise continuous furnace is used, a heated section is heated to 1100-1300 DEG C at the temperature rise speed of 50-200 DEG C / h, and the soaking temperature is 1200-1280 DEG C; as for a compound billet with the thickness being larger than 300 mm, a compartment heating furnace is used, the billet is put in the furnace at the temperature of 600-700 DEG C, the temperature is increased to 1220-1300 DEG C at the temperature rise speed of 100-150 DEG C / h, and soaking is performed at the temperature of 1200-1280 DEG C. By means of the method for producing the CrMnNiMo series ultra-thick mold compound billets, the conventional problems of unstable mold steel flow speed, welding cracking and upwarping can be effectively solved, and the production efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the field of metallurgical composite material preparation technology, and in particular relates to a production method of a CrMnNiMo series ultra-thick mold composite billet. Background technique [0002] With 0.3~0.45wt%C, 0.20~0.80wt%Si, 0.60~1.60wt%Mn, 1.40~2.10wt%Cr, 0.15~0.55wt%Mo, 0.90~1.20wt%Ni as the main composition characteristics (medium carbon, High alloy) pre-hardened plastic mold steel, such as my country's GB standard steel number 3Cr2NiMnMo; German DIN standard material steel number 1.2738; Swedish ASSAB standard steel number 718; American AISI / SAE standard steel number P20+Ni; Japanese JS standard Steel grade SNCM optimization. Widely used in large-scale long-life plastic injection molds, such as molds for home appliances and computer casings. This type of steel usually requires vacuum refining and other processes to ensure the purity of the steel. It has high requirements for the internal quality and the unifo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/24
Inventor 赵坦李广龙范刘群李文斌原思宇王长顺王勇王文仲
Owner ANGANG STEEL CO LTD