Manufacturing method of 14CrMnSi thick pipe plate for pressure vessel

By employing EAF+LF+VD smelting, FM drawing, double-sided center pressing, and composite heat treatment processes, the problems of insufficient low-temperature impact performance and microstructure defects in 14CrMnSi thick tube plates under low-temperature environments were solved, achieving a balance between high strength and high and low temperature toughness.

CN121737558APending Publication Date: 2026-03-27WUXI PAIKE HEAVY CASTING & FORGING
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Patent Information

Application Number
CN202511871918.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-12
Publication Date
2026-03-27

AI Technical Summary

Technical Problem

In the existing technology, the 14CrMnSi thick tube plate for pressure vessels has insufficient low-temperature impact performance in low-temperature environments, and its performance is severely degraded after simulated welding, making it difficult to eliminate internal structural defects.

Method used

The 14CrMnSi steel ingot is smelted using the EAF+LF+VD process, combined with the composite forging process of FM drawing, double-sided center pressing, and hydrogen diffusion isothermal annealing, and the performance heat treatment of high temperature quenching and precision tempering to build an integrated manufacturing solution.

Benefits of technology

The high strength and high and low temperature toughness of 14CrMnSi thick tube plates were achieved in a low temperature environment, internal structural defects were eliminated, and the performance was ensured to be stable after simulated welding.

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Abstract

The invention provides a manufacturing method of a 14CrMnSi thick pipe plate for a pressure vessel. The manufacturing method comprises the following steps: (1) preparing materials; (2) blanking; (3) heating before forging: heating the raw materials to 1250 DEG C, and keeping the temperature for more than or equal to 24 hours; (4) forging is conducted, specifically, upsetting is conducted firstly, drawing-out, upsetting and spinning upsetting are conducted through an FM method, and then upsetting, rounding, flattening and forming are conducted in a double-face center indenting mode; (5) composite pre-heat treatment: after forging, slowly cooling to 280-350 DEG C, and carrying out hydrogen diffusion treatment; then carrying out heat preservation at 920-940 DEG C, then carrying out furnace cooling to 660-700 DEG C, and carrying out isothermal annealing; and (6) performance heat treatment is conducted, specifically, the workpiece is heated to 940-970 DEG C for quenching, and tempering is conducted at 650-670 DEG C after water cooling. The problems that the low-temperature impact performance of the thick-wall forge piece is insufficient, internal structure defects are difficult to eliminate, and performance attenuation is serious after simulation welding are solved.
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