Production of large and super-critical steel-casting by using alkali phenolic aldehyde resin art

Abstract

A technology using alkaline phenolic resin to cast large supercritical steel product with high quality includes such steps as supercritical smelting while strictly controlling the chemical components of steel, preparing sand mould from alkaline phenolic resin for sand core, the alkaline phenolic resin and chromite for surface sand, and alkaline phenolic resin and Si sand for back sand, filling argon gas in mould for 10-15 min, and immediately casting at 1580-1590 deg.C.

Description

technical field [0001] The invention relates to a method for producing large supercritical steel castings with an alkaline phenolic resin sand production process. Background technique [0002] Large supercritical steel castings generally refer to steel types that have been used under high temperature, low temperature, and high pressure for a long time, such as -800°C, 50°C, >30MPa and other environments that can reach the technical indicators of normal use. Supercritical molten steel must meet the following conditions: 1) Low gas content: H 2 <1.5PPM, O 2 <20PPM; 2) Low content of harmful elements: P, S <0.010%; 3) Al: not allowed to add <0.010%; 4) Metallographic analysis: A, B, C, D fine series ≤ 0.5 grade (various inclusions ); 5) N 2 Alloying: Requires N 2 It exists in the state of alloy, at high temperature and normal temperature N 2 Does not overflow. [0003] Supercritical steel is mainly used in thermal power generation units and their auxiliary ...

AI Technical Summary

Problems solved by technology

[0004] At present, there are very few domestic manufacturers that research, develop and produce supercritical steel castings, and mainly produce water glass sand and furan resin sand, with a high scrap rate; due to the backward casting process, the quality and performance of the produced products are very unstable, resulting High production cost and long construction period