Low-alloy, high-strength, high-impact energy extra-large special-shaped ring forging and its forging method

Abstract

The invention discloses a low-alloy high-strength high-impact-energy extra-large special-shaped ring forging. Low-alloy high-strength steel comprises, by weight, 0.08-0.12% of C, 0.5-0.6% of Mn, lessthan or equal to 0.006% of P, less than or equal to 0.006% of S, 0.5-0.65% of Si, 1.4-1.5% of Cr, 0. 55-0.65% of Mo, 0.1-0.2% of Ni, less than or equal to 0.15% of Cu, less than or equal to 0.04% of V, 0.03-0.04% of Nb, 0.02-0.04% of Al, less than or equal to 0.01% of Sn, less than or equal to 0.01% of As, less than or equal to 0.0012% of Sb and the balance Fe and impurities, then through nozzle cold sawing, riser collection, riser heat chopping, then three times of upsetting and two times drawing, broaching chambering, special-shaped ring rolling, preparatory heat treatment, rough turning, sawing, preheating and arc finishing. In this way, chemical compositions of raw materials are optimized, a reasonable matching heat treatment system is adopted, the stability of the impact work can be improved through maximum simulated post-weld heat treatment of the materials, the product once inspection pass rate is increased to 100%, energy waste caused by rework and repair is avoided, the production cycle is shortened, the manufacturing cost is reduced, and the competitiveness of enterprises is improved.

Description

technical field [0001] The invention relates to the technical field of forging manufacture, in particular to a low-alloy, high-strength, high-impact extra-large special-shaped ring forging and a forging method thereof. Background technique [0002] Low-alloy high-strength steel SA336F11CL1 is a European standard ASME material. Its mechanical properties meet the requirements of tensile strength: 415-585Mpa, yield strength: ≥310Mpa, elongation: ≥20%, and reduction of area ≥45%. It is widely used in boilers, pressure Energy fields such as containers, high temperature parts and their auxiliary parts. [0003] In recent years, hydrogenation technology has developed rapidly. Hydrogenation reactor is a key part of oil refining equipment. It works in the environment of high temperature, high pressure, hydrogen, high temperature sulfur and hydrogen sulfide. The use conditions are harsh, and the base material is prone to high temperature temper brittleness. , the weld and the base me...

AI Technical Summary

Problems solved by technology

At the same time, the conventional mechanical properties and the performance after the minimum simulated post-weld heat treatment are all qualified, but after the maximum simulated post-weld heat treatment, the pass rate is very low. One of the variables is that the high temperature lasts for a long time, and the temper brittleness of the material is relatively large.

Images