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Blackening process for hot die steel

A hot work die steel and process technology, applied in the direction of metal material coating process, etc., to achieve the effect of black and bright color, improving process flow and increasing blackening temperature

Active Publication Date: 2009-08-05
HARBIN MEASURING & CUTTING TOOL GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the blackening process of hot work die steel 4Cr5MnSiV1 (H13) is still blank in China, and the blackening process formula in foreign countries uses nitrate

Method used

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Embodiment 1

[0016] Hot work die steel blackening process, its composition includes: the pretreatment to hot work die steel 4Cr5MnSiV1 (H13), the hot work die steel described through pretreatment goes through a blackening treatment, hot water washing, pickling according to the technological process , cold water washing, secondary blackening treatment, hot water washing, hard film treatment, cold water washing, three blackening treatment, saponification, hot water washing, drying, oil immersion to complete the blackening of hot work die steel, the blackening treatment It is to place the hot work die steel in the mixed solution of sodium hydroxide, nitrite and iron ion additives for 60-70 minutes at a temperature above 155°C, and the concentration of sodium hydroxide in the mixed solution is 500 -700g / L, the concentration of nitrite is 250-400g / L, and the concentration of iron ion additive is 0.9-1.5g / L.

[0017] In the blackening process of hot work die steel, the hard film treatment is to ...

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Abstract

The invention relates to a blackening process of hot die steel, currently, the blackening process of hot die steel is a vacancy in China, and the blackening process adopts nitrates in foreign countries. The blackening process of the hot die steel comprises the following steps: the hot die steel is pretreated; the pretreated hot die steel is treated by the processes of primary blackening, hot water rinsing, acid cleaning, cold water rinsing, secondary blackening, hot water rinsing, hardening, cold water rinsing, three-step blackening, saponifying, hot water rinsing, drying and oil-immersing so as to finish the blackening to the hot die steel, wherein the blackening comprises the following steps: the hot die steel is put into mixed liquor of sodium hydroxide, nitrites and iron ion additive for 60-70 minutes under the temperature condition of more than 155 DEG C, wherein the sodium hydroxide concentration in the mixed liquor is 500-700g / L, the nitrite concentration in the mixed liquor is 250-400g / L, and the iron ion additive concentration in the mixed liquor is 0.9-1.5g / L. The invention is the blackening process of the hot die steel.

Description

Technical field: [0001] The invention relates to a steel blackening process, in particular to a hot work die steel blackening process. Background technique: [0002] At present, the blackening process of hot work die steel 4Cr5MnSiV1 (H13) is still blank in China, and the formula of blackening process abroad uses nitrate. Invention content: [0003] The object of the present invention is to provide a blackening process for hot work die steel, which forms a black oxide film layer with black and bright color, good bonding force and certain anti-corrosion ability on the surface of hot work die steel after three blackening treatments. [0004] Above-mentioned purpose realizes by following technical scheme: [0005] Blackening process of hot work die steel, its composition includes: pretreatment of hot work die steel, said hot work die steel after pretreatment undergoes blackening treatment, hot water washing, pickling, cold water washing, Secondary blackening treatment, hot ...

Claims

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Application Information

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IPC IPC(8): C23C22/62C23C22/78C23G1/08
Inventor 徐宏伟
Owner HARBIN MEASURING & CUTTING TOOL GROUP CO LTD
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