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17-4PH steel surface reinforcement method

A technology of surface strengthening and yield strength, applied in the field of metal materials and heat treatment, can solve the problems of poor wear resistance, shortened service life of equipment, low hardness of machine parts, etc., and achieve the effect of excellent stress corrosion cracking resistance and wear resistance

Active Publication Date: 2006-10-11
SHENYANG BLOWER WORKS GROUP CORP
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  • Application Information

AI Technical Summary

Problems solved by technology

In the second state, the machine parts have low hardness and poor wear resistance, and the service life of the equipment is shortened

Method used

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Examples

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Embodiment Construction

[0013] The present invention will be described in detail below in conjunction with the examples.

[0014] 1. Preparatory heat treatment

[0015] 1. Anti-internal crack annealing after forging: furnace cooling at 600°C;

[0016] 2. Solid solution + overaging treatment: oil quenching at 1040°C + air cooling and tempering at 620°C, yield strength ≥ 750Mpa, tensile strength ≥ 850Mpa, section retraction rate ≥ 60%, elongation ≥ 19%, impact power ≥ 100J, Hardness≤33;

[0017] 3. Stabilization treatment: furnace cooling at 600°C;

[0018] 2. Final heat treatment

[0019] 1. Surface solution treatment: workpiece rotation speed is 110r / min, sensor moving speed is 2.3mm / s, heating temperature is 1060°C, cooling method is compressed air spraying at an angle of 30°, and cooling temperature is ≯90°C.

[0020] 2. Surface aging treatment: use equipment well-type resistance furnace, heating speed ≤ 100 ℃ / h, heating temperature 480 ℃, holding time 3 hours, cooling method furnace cooling ...

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Abstract

The invention provides a method of strengthening 17-4PH steel surfaces; the method can solved the problem as follow: 17-4PH steel often use in two kinds of heat treatment condition as follow: first, solid solution time-effect condition; second, solid solution over aging condition. The first condition, the machine member strength machine member 1200Mpa, stress corrosion trend seriously, general solution method of adopting decrease working efficiency or enlarge the section size of machine member. The second condition, the machine member in low degree of hardness, badly abrasion-resistance, the shortly operating life of equipment. The invention key point as follow: firstly, pre-heating treatment: contain preventing internal break anneal after smith and solid solution + time-effect treatment, then stabilizing treatment; finally, final thermal treatment: contain surface solid solution treatment and surface time-effect treatment. The initiative effect of invention as follow: heating solid solution time-effect treatment though machine member surface induction, the hardness of machine member core less then 33, fitting the hardness condition that the steel utilize in acidic medium; the surface deck hardness 42-45 in the area of 0.8-1.5mm, the deck resistance to corrosion stress cracking function and abrasion-resistance are good.

Description

technical field [0001] The invention relates to the field of metal materials and heat treatment, and relates to a heat treatment process method of martensitic precipitation hardening steel with excellent stress corrosion cracking resistance and wear resistance. Background technique [0002] When general mechanical equipment such as gas compressors and water pumps are used in acidic media, especially high-concentration hydrogen sulfide media, wear and stress corrosion problems must be considered at the same time for the worn parts, which is related to the safe operation and service life of the equipment. 17-4PH steel is usually used in the following two heat treatment states: one is 1040°C+480°C, which is the solution aging state; the other is 1040°C+620°C, which is the solution overaging state. In the first state, the strength of the machine parts exceeds 1200Mpa, and the tendency of stress corrosion is serious. Generally, it is solved by reducing the work efficiency or incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D1/78C21D7/13C21D1/42
CPCY02P10/25
Inventor 王洪范
Owner SHENYANG BLOWER WORKS GROUP CORP
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