种优质H13钢制备方法

• Format: Patent
• Language: Chinese
• Published: 10.07.2018
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS

本发明涉及优质热作模具钢制备领域，具体为种优质H13钢制备方法。该方法采用电炉-LF精炼炉-VD脱气处理-模铸坯料制备工艺，其中电炉实现防过氧化深脱磷操作，出钢时P≤30ppm；精炼时经石灰、预熔渣、Al等脱氧剂进行深脱氧精炼处理后，使VD脱气处理前硫含量≤0.002wt％，VD脱气处理后硫含量≤0.001wt％，N含量在0.0060wt％以下，最后经全封闭氩气保护，坯料纯净度水平稳定达到T.O＝10±2ppm，P≤100ppm，S≤10ppm，N≤90ppm，夹杂物水平均小于1.0级，其中球形夹杂物数量超过65％，Ds最大夹杂物尺寸≤20μm。从而，解决在制备优质H13钢模铸坯料时，其纯净度水平要求高、并难稳定控制的技术难题。 The invention relates to the field of preparation of high-quality hot-work die steel and particularly relates to a method for preparing high-quality steel H13. The method adopts an electric furnace-LF refining furnace-VD degassing treatment-die cast blank preparation process, wherein an electric furnace is used for achieving anti-peroxidation deep-dephosphorization operation, and P is not higher than 30ppm during tapping; after deep-deoxidation refining treatment is carried out by deoxidants such as lime, pre-molten slag and Al during refining, the sulfur content before VD degassing treatment is not higher than 0.002wt%, the sulfur content after VD degassing treatment is not higher than 0.001wt%,