PROPRIETARY Pyrowear 675 Stainless 不锈钢
材料组别:
黑色金属 / 不锈钢
国家与地区/标准:
PROPRIETARY
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最新更新: 2022-08
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PROPRIETARY Pyrowear 675 Stainless 化学成分
化学元素
数值
单位
CAS 编号
化学元素
C
数值
≤ 0.07
单位
%
CAS 编号
7440-44-0
化学元素
Co
数值
≤ 5.40
单位
%
CAS 编号
7440-48-4
化学元素
Cr
数值
≤ 13.00
单位
%
CAS 编号
7440-47-3
Carpenter Technology Corporation, Product Data Sheets,
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PROPRIETARY Pyrowear 675 Stainless 物理性能
PROPRIETARY Pyrowear 675 Stainless 热处理
- Decarburization: Carburized Pyrowear 675 stainless, like all high carbon steels, is subject to decarburization during thermal processing. Means of preventing decarburization are well known. Modern furnaces which employ protective environments, such as a protective atmosphere, salt pots, fluidized bed furnaces, and vacuum furnaces, should present no difficulty with decarburization of this alloy.
Annealing: Pyrowear 675 stainless should be annealed at 621/649°C (1150/1200°F) for a minimum of 4 hours, followed by air cooling. This should produce a maximum hardness of Brinell 320. An annealed hardness as low as Brinell 280 can be obtained by holding parts at 649°C (1200°F) for 12 hours, followed by air cooling. Annealing for times longer than 12 hours will not result in any additional significant softening.
Carburizing:
1. Preoxidizing: Pyrowear 675 stainless must be preoxidized prior to carburizing. This can be accomplished by heating clean parts to a temperature between 899 and 1038°C (1650 and 1900°F) for a minimum of 1 hour in an air furnace followed by an air cool, or by allowing the part to be exposed to an air atmosphere in the carburizing furnace prior to introducing the carburizing gas. It should be noted that Pyrowear 675 stainless preoxidizing temperatures on the lower side of the range will produce a better case structure following carburizing.
2. Carburizing Temperature: The recommended carburizing temperature range for Pyrowear 675 stainless is 871/899°C (1600/1650°F) . In general, the 927°C (1700°F) temperature used for other carburizing grades is too high a temperature for Pyrowear 675 stainless.
3. Carbon Potential: In general a carbon potential of 0.65/1.0 percent is adequate for most applications. The actual surface carbon content following carburizing at this carbon potential will result in sufficient carbon in the case to achieve a surface hardness of HRC 60 minimum during final heat treatment.
4. Carburizing Time: As in most carburizing operations, carburizing time is directly related to case depth for this alloy. Samples carburized for 24 hours provided a fully heat treated HRC 60 depth of 0.020" (0.51mm) and an HRC 50 depth of 0.045" (1.14mm)
5. Post Carburizing Quench: Following carburizing, parts with diameters greater than about 1" (25.4 mm) should be oil quenched. Smaller parts may be oil quenched or air cooled. Once the parts have reached room temperature, they should be given a stress relief anneal at 621/649°C (1150/1200°F) for 4 hours minimum.
6. Post Carburizing Normalize and Stress Relief (Optional): To ensure the best case microstructure, a double normalizing cycle may be employed following carburizing. Parts should be heated to 1038°C (1900°F), held 1/2 hour, and air cooled. This should be done for 2 cycles. Parts should then be stress relief annealed at 621/649°C (1150/1200°F) for 4 hours minimum and air cooled. Double normalizing may also slightly increase carburized case depth. Because carburized Pyrowear 675 stainless has a high case carbon level, proper control of furnace atmosphere to prevent decarburization during subsequent heat treatment is very important.
Hardening: Pyrowear 675 stainless should be heat treated using proper precautions to prevent decarburization. Parts should be austenitized for 15/30 minutes and either oil quenched to room temperature or quenched into salt at 204°C (400°F) equalized, and air cooled to room temperature. After reaching room temperature, parts should be refrigerated at -73°C (-100°F) for 1 hour and air warmed in order to obtain maximum case hardness. For service temperatures 204°C (400°F) and below: Austenitize at 1038°C (1900°F) 15 minutes, quench to room temperature. For service temperatures above 204°C (400°F): Austenitize at 1038/1052°C (1900/1925°F) 15 minutes, quench to room temperature.
Tempering: Parts should be tempered immediately upon completion of refrigeration. All temperi
PROPRIETARY Pyrowear 675 Stainless 机械性能
PROPRIETARY Pyrowear 675 Stainless 的全球近似对照材料
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- 4应力-应变
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