2012年9月26日
涵盖了主题
介绍
化学成分
物理特性
机械性能
Thermal Properties
其他名称
Fabrication and Heat Treatment
Machinability
焊接
热工作
冷工作
退火
回火
Hardening
Applications
介绍
Stainless steels are high-alloy steels. They contain about 4-30% of chromium. They are further classified into three types such as martensitic, austenitic, and ferritic steels. Another group of stainless steels are precipitation-hardened steels. They are a combination of austenitic and martensitic steels.
350级不锈钢合金是可热处理的奥氏体/马氏体合金。以下数据表概述了350级不锈钢合金。
化学成分
The following table shows the chemical composition of grade 350 stainless steel alloy.
| Element |
Content (%) |
铁，铁
|
72.69-76.29
|
| Chromium, Cr |
16-17 |
| 镍，尼 |
4-5 |
| Molybdenum，密苏里州 |
2.5-3.25 |
| 明尼苏达州锰 |
0.5-1.25 |
| Silicon, Si |
0.5 |
| 氮，n |
0.07-0.13 |
| Carbon, C |
0.07-0.11 |
| 磷，p |
0.04 |
| Sulfur, S |
0.03 |
物理特性
下表突出显示了350级不锈钢合金的物理特性。
| Properties |
Metric |
Imperial |
| Density |
7.7-8.03 cm3 |
0.278-0.290 lb/in3 |
机械性能
The following table outlines the mechanical properties of grade 350 stainless steel alloy.
| Properties |
Metric |
Imperial |
| Tensile strength |
1105 MPA |
160266 PSI |
| Yield strength |
415 MPa |
60190 psi |
| Elastic modulus |
190-210 GPa |
27557-30458 ksi |
| Poisson's ratio |
0.27-0.30 |
0.27-0.30 |
| Elongation |
30％ |
30％ |
| 硬度 |
95 |
95 |
Thermal Properties
下表显示了350级不锈钢合金的热性能。
| Properties |
Metric |
Imperial |
Thermal expansion co-efficient (@ 20-100°C/70-212°F)
|
11.3 µm/m°C |
6.55 µin/in°F |
Thermal conductivity (@ 38°C/100°F)
|
14.5 W/MK |
100.7 btu in/hr.ft²。°F |
其他名称
Other designations that are equivalent to grade 350 stainless steel alloy include:
- AMS 5546
- AMS 5548
- AMS 5554
- ASTM A579
- ASTM A693
- MIL S-8840
- AMS 5745
- AMS 5774
- AMS 5775
- SAE J467（AM-350）
Fabrication and Heat Treatment
Machinability
Grade 350 stainless steel alloy can be machined using practices applied on high strength stainless steels. It is recommended to use sharp tooling, positive feeds, slow speeds, and adequate lubricant.
焊接
除氧乙烯焊接方法外，可以使用所有常见技术焊接350级不锈钢合金。焊接后，该合金被退火以恢复最大性能。
热工作
在1177°C（2150°F）加热后，进行350级不锈钢合金的热量工作。此过程在982°C（1800°F）下完成
冷工作
Grade 350 stainless steel alloy can be cold worked in the annealed condition. Radical deformation of this alloy is limited due to its high work hardening rate and the formation of martensite.
退火
350级不锈钢通过在1010至1066°C（1850至1950°F）下浸泡，然后进行淬火，从而退火。
回火
350级不锈钢浸泡在-73°C（-100°F）。然后将其在454°C（850°F）下进行回火，以达到最大强度或538°C（1000°F），以达到3至4 h的最大韧性和耐腐蚀性。
Hardening
350级不锈钢可以通过零下或双重衰老来硬化。在执行此过程之前，该合金是通过在932°C（1710°F）的快速冷却来制备。
Applications
Grade 350 stainless steel is used in valve and gas turbine components, and industrial cutters which require good strength and corrosion resistance.