温州凯信金属有限公司
Stainless steel 317
Stainless Steel 317 was designed to be a higher strength alternative to the 316 grades. Composed of larger amounts of chromium, nickel and molybdenum, SS 317 also is more corrosion resistant compared to 316, and tougher than Type 304. This is the due to the high percentage of iron in its composition, which is much higher than many stainless steels. This combination of iron with the chromium-nickel-molybdenum content yields a strong, hardy alloy.
In terms of working capability, all common welding, hot working and cold working practices can be applied. 317 demonstrates good versatility. It will only work harden under cold working, which will also increase its strength. When heat treating this metal, temperatures should not drop below 1700°F as this is the threshold for response.
Stainless steel 317 is commonly found in the textile industry, where its strength and corrosion resistance can be utilized. Other applications include the manufacturing of chemical equipment and the machines used in pulping paper.
Stainless steel 317L
Stainless Steel 317L is the low-carbon derivative of SS 317. The metal maintains its high strength and strong corrosion resistance; however, the carbon content does have several effects. 317L has greater strength under welding; its products are stronger.
Like 317, stainless steel 317L does not respond or harden from heat treatments. When hot working, the metal should be heated ideally within the range of 2100-2300°F. Dropping below 1700°F will cause the metal to be unresponsive. For these reasons, 317L is effective in high temperature areas that experience high rates of chemical corrosion, creep, and stress-to-rupture.
317L is commonly utilized in chemical environments. It has shown itself to be effective in conditions where acids are present, such as acidic chloride. The metal is resistant to corrosion from such substances. As such, it is common to find 317L in equipment used in pulp and paper mills. The acidic environment requires a strength, corrosion resistant metal..
317/317lstainless steel 1.4571 Finished Products Form
- 片材
- 板材
- 酒吧
- 管材（焊接管和无缝管）
- 配件
- Elbows, tees, stub-ends, returns, caps, crosses, reducers, pipe nipples, etc.
- Weld Wire (AWS E317L-16, ER317L)
Applications for 317/317l stainless steel
- 石油和天然气工业
- 制药业
- 纺织工业
- 水管系统
- 制酸和化学工业
- 饮料业
- 炼油厂
- 汽车工业
- 水泥工业
- 食品工业
- 造纸和纸浆工业
Equivalents of grade317/317L
| 美国材料与试验协会 | UNS | EN | DIN 标准 | JIS |
| 317 | S31700 | 1.4449 | X3CrNiMo18-12-3 | SUS317 |
| 317L | S31703 | 1.4438 | X2CrNiMo18-15-4 | SUS317L |
组成 ranges for 317/317L grade of stainless steel
| Weight% | C | 锰 | Si | Cr | 倪 | 莫 | P | S | N | 铁 |
| 317 | 0.08 max | 2.0 最大值 | 0.75 max | 18-20 | 11-15 | 3-4 | 0.045 | 最大 0.030 | 0.10 max | Bal |
| 317L | 最大 0.030 | 2.0 最大值 | 0.75 max | 18-20 | 11-15 | 3-4 | 0.045 | 最大 0.030 | 0.10 max | Bal |
机械性能
| 等级 | 拉伸强度 ksi (min.) | Yield Strength 0.2% Offset ksi (min.) | Elongation – % in 50 mm (min.) | 硬度 (Brinell) MAX | 硬度 (Rockwell B) MAX |
| 317 | 75 | 30 | 35 | 217 | 95 |
| 317L | 75 | 30 | 40 | 217 | 95 |
物理特性
| 317 | 317L | Temperature in °C | |
| 密度 | 7.99 g/cm³ | 7.99 g/cm³ | Room |
| Specific Heat | 0.12 Kcal/kg.C | 0.12 Kcal/kg.C | 22° |
| Melting Range | 1371 – 1421 °C | 1371 – 1421 °C | - |
| Modulus of Elasticity | 193 KN/mm² | 193 KN/mm² | 20° |
| 电阻率 | 74 µΩ.cm | 79 µΩ.cm | Room |
| Coefficient of Expansion | 16.0 µm/m °C | 16.0 µm/m °C | 20 – 100° |
| 导热性 | 16.2 W/m -°K | 16.2 W/m -°K | 20° |
机械加工性能
Grade 317 stainless steel is tougher than 304 stainless steel. It is recommended to use chip breakers. Hardenability of this alloy will be reduced if constant feeds and low speeds are used.
耐腐蚀性
• Stainless 317/317L has a high tensile and creep strength at elevated temperatures. Due to its excellent corrosion resistance it has been used in handling many of
the chemicals used by the chemical process industries especially in acidic chloride environments such as those encountered in pulp and paper mills. Increased levels
of chromium, nickel and molybdenum compared to 316L stainless steel improve resistance to chloride pitting and general corrosion.
• Good oxidation resistance in continuous service to 925℃ and in intermittent service to 879℃. The corrosion resistance of 317 and 317L should be the same in any
given environment. The one exception is where the alloy will be exposed to temperatures in the chromium carbide precipitation range of 800–1500°F (427–816°C).
Because of its low carbon content, 317L is the preferred material in this service to guard against intergranular corrosion.
• Resistance increases with molybdenum alloy content. 317L is resistant to sulfuric acid concentrations up to 5 percent at temperatures as high as 120°F (49°C). At
temperatures under 100°F (38°C) this alloy has excellent resistance to solutions of higher concentration. However, service tests are recommended to account for
the affects of specific operating conditions that may affect corrosion behavior. In processes where condensation of sulfur-bearing gases occurs, 317L is much more
resistant to attack at the point of condensation than conventional alloy 316. The acid concentration has a marked influence on the rate of attack in such environments
and should be carefully determined by service tests
热处理选项
1 +A：退火（完全/软化/球化）
2 +N: 归一化
3 +NT：正火和回火
4 +QT：淬火和回火（水/油）
5 +AT: Solution annealed
6 +P： 沉淀硬化
热工作
Grade 317 stainless steel can be hot worked using all common hot working procedures. It is heated at 1149-1260°C (2100-2300°F). It should not be heated below 927°C (1700°F). Post-work annealing can be done to retain the corrosion resistance property.
冷加工
Stamping, shearing, drawing, and heading can be done successfully. Post-work annealing is performed in order to reduce internal stress.
退火
1850-2050 F (1010-1121 C) followed by fast cooling.
硬化
These alloys do not reply to heat treatment. Cold work will cause an increase in both hardness and strength.
焊接
Grade 317L stainless steel can be welded using fusion and resistance methods. Oxyacetylene welding method is not preferred for this alloy. AWS E/ER317 or 317L filler metal can be used to obtain good result.
316 vs 317 Stainless Steel: Key Differences
Understanding the differences between 316 and 317 stainless steels is crucial for selecting the right material. While both are austenitic stainless steels, 317 contains more molybdenum.
This higher molybdenum content provides enhanced resistance to corrosion and high temperatures.
Key Differences:
- Molybdenum content: 317 has more.
- Corrosion resistance: 317 is superior.
- Cost: 317 is generally more expensive.
These differences make stainless steel 317 a preferred choice in extreme environments where corrosion resistance is a priority. The choice often depends on specific project needs and budget considerations.
Advantages of 317 Stainless Steel
317 Stainless Steel stands out due to its impressive attributes. This alloy excels in providing durability and corrosion resistance in demanding environments.
Key advantages include:
- High corrosion resistance, especially in saline and harsh chemical environments.
- Excellent strength and durability, increasing the lifespan of applications.
- Ease of fabrication, making it versatile in manufacturing processes.
结论
317 Stainless Steel is a versatile and durable alloy. Its excellent corrosion resistance and strength make it ideal for demanding environments. Whether in chemical processing or marine settings, its advantages are clear, ensuring long-term performance and reliability.