Gb Cr12mo1v1 Alloy Steel Quenching And Tempering Process - China

Quenching Process: A Key Factor Determining Mold Life 2.1 Preheating Treatment Specifications

GB Cr12Mo1V1 alloy steel has poor thermal conductivity and high alloy element content, requiring **staged preheating** to prevent cracking: | Preheating Stage | Temperature Range | Holding Time | Purpose | ||||| | First Stage | 500-550℃ | 30-40min | Eliminate processing stress, achieve temperature uniformity | | Second Stage | 800-850℃ | 20-30min | Reduce thermal stress during high-temperature heating | 2.2 Quenching Heating Parameters **Recommended Quenching Temperature**: **980-1030℃** (Adjust according to hardness requirements) | Application Type | Quenching Temperature | Target Hardness | Applicable Scenarios | ||||| | High Toughness Requirements | 980-1000℃ | HRC 58-60 | Impact Load Dies | High Wear Resistance Requirements | 1010-1030℃ | HRC 60-62 | Long-Life Blanking Dies | Special High Hardness | 1050-1080℃ | HRC 62-64 | Thin Sheet Blanking and Wire Drawing Dies | Tempering Process: The Core of Performance Control ### 3.1 Relationship between Tempering Temperature and Hardness GB Cr12Mo1V1 alloy steel belongs to **secondary hardening steel**, exhibiting a significant hardness peak at 500-550℃: Hardness Change Trends:

Low Temperature Range (150-200℃): Hardness slightly decreases, stress release

Medium Temperature Range (200-400℃): Hardness continues to decrease

High Temperature Range (500-540℃): Secondary hardening, hardness recovers to peak

Ultra-High Temperature Range (>550℃): Hardness decreases significantly ### 3.2 Recommended Tempering Specifications | Tempering Type | Temperature Range | Tempering Times | Holding Time | Final Hardness | Application | ||||||| | Low Temperature Tempering | 180-220℃ | 1 time | 2-3h | HRC 60-62 | Cold Working Dies | | Medium Temperature Tempering | 250-350℃ | 1 time | 2h | HRC 58-60 | Dies Requiring Toughness | | **High Temperature Tempering** | **510-540℃** | **2-3 times** | **2h/time** | **HRC 58-61** | **Optimal Overall Performance** |

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