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A kind of production method of crmnnimo series extra-thick mold composite billet
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A production method and composite billet technology, which is applied in the production field of CrMnNiMo series extra-thick mold composite billets, can solve problems such as welding cracking and speed flow instability, and achieve the effects of reducing production pressure, low production cost, and reducing watermarks
Active Publication Date: 2017-09-26
ANGANG STEEL CO LTD
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[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
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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
Contentwt%
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] All six sides of the billet are milled, especially for the composite interface, after rough milling to grind fresh metal, continue to finish milling 0.7mm, 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 weld...
Embodiment 2
[0042] Steel type: 2738, billet thickness H = 296mm
[0043] Table 2 embodiment 2 billet chemical composition
[0044]
[0045]
[0046] 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.
[0047] 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 type For 2.56T, enter the vacuum chamber to evacuate and stack them in parallel, ready for welding.
[0048] The welding sequence is spot welding and continuous welding. Choose a vacuum chamber welding atmosphere of 300±10°C.
[0049] Among them, the spot welding is carried out in the way of "first long and then short". The specifi...
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Abstract
A production method of CrMnNiMo series ultra-thick mold composite billet, the long side L length / short side L short ≥ 2.5 of the continuous casting billet; the six sides of the billet are processed by a milling machine, and the composite interface Ra=3~6μm; Spot welding first and then continuous welding in an atmosphere of ~500℃; welding current 50~180mA, speed 220~350mm / min; within 1 hour after welding, enter the heat treatment furnace for 0.5~1min / mm medium temperature tempering or annealing; for thickness between 100~ The 300mm composite billet adopts a walking continuous furnace, the heating section is heated to 1100~1300℃ at a heating rate of 50~200℃ / h, and the soaking temperature is 1200~1280℃; the composite billet with a thickness > 300mm adopts a chamber heating furnace, Install the furnace at 600-700°C, raise the temperature to 1220-1300°C at a rate of 100-150°C / h, and soak at 1200‑1280°C. The invention can effectively solve the problems of mold steel velocity instability, welding cracking, lifting and welding cracking heredity, and greatly improve production efficiency.
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 No. SNCM. 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 uniformity of ...
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