Nuclear-grade high-strength and high-intergranular corrosion-resistant large-section stainless steel forged tube and manufacturing method thereof
A technology of intergranular corrosion and manufacturing method, which is applied in the field of stainless steel materials and its preparation process, can solve problems such as coarse austenite grains, inconsistent distribution of austenite grains, mismatch between intergranular corrosion resistance and strength, etc. achieve excellent performance
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[0046] The preparation process of the stainless steel forged pipe is: batching→electric furnace smelting→AOD refining→steel ingot→cutting head / tail→electroslag remelting→electroslag ingot→cutting head / tail→upsetting and drawing length blank→extrusion piercing→ Radial forging→controlled cooling→pipes→solution aging heat treatment→machining→hydraulic testing→pickling→products. The specific process is as follows:
[0047] In the first step, the ratio of raw materials is carried out according to the above-mentioned component content. In order to avoid the gas in the raw materials from being brought into the smelting furnace, the raw materials are baked and put into the electric arc furnace for smelting. During the smelting process, common cullet (main component for Na 2 O CaO aSiO 2 ) as a slagging material, the amount added is about 1.5-3.0wt% of the total weight of the raw materials. After the raw materials are completely melted into molten steel, reduce the power of the elect...
Embodiment 1
[0055] According to the nuclear-grade high-strength and high-intergranular corrosion-resistant large-section forged stainless steel tube of the present invention, the content of different components of each example product of the forged stainless steel tube is shown in Table 1.
[0056] The chemical composition (wt%) of the embodiment of table 1
[0057] Numbering C Si mn Cr Ni Cu N co B Mo Nb Ti Al P S Fe Example 1 0.01 1.0 4.0 18.0 7.0 2.0 0.4 0.05 0.07 2.5 0.2 0.6 0.05 0.028 0.011 margin Example 2 0.035 0.5 2.0 21.0 5.0 3.1 0.22 0.01 0.08 3.5 0.13 0.11 0.07 0.021 0.008 margin Example 3 0.26 0.77 3.8 19.4 6.4 4.0 0.35 0.03 0.54 2.8 0.16 0.52 0.12 0.03 0.015 margin Example 4 0.32 0.81 2.2 20.7 5.5 3.5 0.37 0.04 0.63 3.1 0.14 0.33 0.11 0.01 0.007 margin Example 5 0.015 0.55 3.0 18.7 6.8 2.3 0.2 0.02 0.28 2.9 0.10 0.10 0.06 0.02 0.011 mar...
Embodiment 2
[0069] The first step, smelting process: chemical composition is calculated proportioning according to embodiment 1, in smelting process, adds common cullet (main component is Na 2 O CaO aSiO 2 ) as a slagging material, the amount added is about 3.0wt% of the total weight of the raw materials. After the raw materials are completely melted into molten steel, reduce the power of the electric furnace to keep the melting temperature at 1650 ° C, and tilt the furnace to remove slag, and then add low-carbon ferromanganese Deoxidize with ferrosilicon, then increase the power of the electric furnace to make the molten steel temperature reach 1680°C, and perform multi-point aluminum deoxidation, respectively feed aluminum at 4 or 8 points at the radius of 1 / 2 of the melting furnace mouth, and the speed is about 1.5kg / t ;Argon and oxygen are blown in during the AOD smelting process, and the ratio of argon to oxygen changes with the degree of oxidation reaction in the smelting process, s...
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