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A technology of martensitic stainless steel and heat treatment method, which is applied in the field of NM martensitic stainless steel cylinder forging, can solve the problems that tempering temperature has a great influence on performance, mechanical properties are difficult to control, and large internal stress, etc., so as to reduce production scrap risk, the effect of stabilizing mechanical properties
Active Publication Date: 2018-04-20
BAODING TECH CO LTD
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However, F6NM martensitic stainless steel has poor thermal conductivity. If the furnace temperature is too high or the temperature rises too fast, large internal stress will be generated and small cracks will appear. After forging, the cracks will expand and lead to scrapping. It will produce reversed austenite structure, the tempering temperature has a great influence on the performance, and the mechanical properties are difficult to control
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Embodiment 1
[0039] Embodiment 1: with reference to attached figure 1 and 2 . Two furnaces of steel ingots were selected for production.
[0040] 1. The chemical composition is shown in the following table---the chemical composition table of steel ingot.
[0041] furnace number
C
Si
mn
P
S
110-65003
0.035
0.36
0.76
0.016
0.003
110-65004
0.034
0.35
0.75
0.016
0.004
furnace number
Cr
Ni
Mo
V
110-65003
12.32
4.22
0.55
0.05
110-65004
12.29
4.18
0.54
0.06
[0042] 2. The heating process adopts segmented isothermal slow heating, and the furnace loading temperature, heating speed and holding time are strictly controlled. The specific process is as follows: figure 2 shown.
[0043] 3. Before forging, preheat the special anvil, punch and mandrel and other tooling to avoid cracks caused by large temperature differences; the initial forging temperature of ...
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PUM
Property
Measurement
Unit
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Abstract
The invention relates to a F6NM martensitic stainless steel cylinder-body forge piece and a heat treatment method. According to the F6NM martensitic stainless steel cylinder-body forge piece and the heat treatment method, the high strength and the high low temperature impact toughness resistance can be met, cracks are avoided, and meanwhile, cracking and scrap of steel ingots during forging are avoided; and the F6NM martensitic stainless steel cylinder-body forge piece comprises, by mass, no more than 0. 04% of C, 0.30-0.50% of Si, 0.70-1.00% of Mn, 11.5-13.0% of Cr, 3.5-4.5% of Ni, 0.50-0.70%of Mo, 0.04-0.1% of V, no more than 0.020% of P and no more than 0.010% of S. The F6NM martensitic stainless steel cylinder-body forge piece has the advantages that the F6NM martensitic stainless steel cylinder-body forge piece after being subjected to component optimization adopts sectional-type constant-temperature slow heating, the charging temperature, the heating speed and the heat preservation time are strictly controlled, forging is strictly executed according to the new forging process, and heat treatment adopts the special heat treatment process of 550 DEG C constant-temperature heating, 1000 DEG C air quenching and three times of tempering at 690 DEG C, 630 DEG C and 590 DEG C. After production, product inspection dimensions confirm to the customer drawing requirements, a sampleis sampled and sent to a third party for being tested, the mechanical properties meet the index requirements, after multiple times of production, the mechanical properties of the F6NM martensitic stainless steel cylinder-body forge piece are all very stable, and the F6NM martensitic stainless steel production scrap risk is greatly reduced.
Description
technical field [0001] The invention relates to a F6NM martensitic stainless steel cylinder body with a diameter greater than 953mm and a length greater than 1385mm. It is required to meet high strength, high low temperature impact toughness, and avoid cracks. Disclosed are cracked and scrapped F6NM martensitic stainless steel cylinder forgings and a heat treatment method, belonging to the field of manufacturing stainless steel cylinder forgings. Background technique [0002] F6NM material is the material in ASTM A336 / A336M-09 "Standard for Alloy Steel Forgings for High Temperature Pressure Components" of the American Society for Testing and Materials. It belongs to martensitic stainless steel, and its chemical composition contains 13% Cr and 4% Ni, which is quite In the domestic brand 0Cr13Ni4Mo. [0003] F6NM material is a new type of martensitic stainless steel used in the manufacture of large castings and forgings. In today's increasingly stringent environmental protec...
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