317L is a molybdenum bearing austenitic chromium nickel steel similar to type 316, except the alloy content in 317L is somewhat higher.

不锈钢317 L在温度升高时具有较高的拉伸力和蠕变强度。由于其出色的耐腐蚀性,它已用于处理化学工艺行业使用的许多化学物质。



Specifications - Stainless Steel 317L

317L (00Cr19Ni13Mo3, SUS317L) alloy is based on molybdenum and austenitic stainless steel. It is more resistant to chemical corrosion than normal chrome-nickel austenitic stainless steel, such as 304 alloys. In addition, compared with conventional stainless steel, 317L alloys have higher ductility, anti-stress corrosion, compressive strength and high temperature resistance. It is a low carbon grade or L rating, which has the ability to resist sensitization during welding and heat treatment.

Chemical Composition - Stainless Steel 317/317L
Grade 317 317L
UNS Designation S31700 S31703
Carbon (C) Max. 0.08 0.035*
Manganese (Mn) Max. 2.00 2.00
Phosphorous (P) Max. 0.040 0.04
0.03 0.03
Silicon (Si) Max. 1.00 1.00
Chromium (Cr) 18.0–20.0 18.0–20.0
镍(NI) 11.0–14.0 11.0–15.0
Molybdenum (Mo) 3.0–4.0 3.0–4.0
Nitrogen (N)
铁(铁) Bal. Bal.
Other Elements
Typical Mechanical Properties- Stainless Steel 317L
材料 Ultimate Tensile Strength (Mpa) 0.2%的屈服强度(MPA)
% Elongation in 2" Rockwell B Hardness
合金317 515 205 35 95
合金317L 515 205 40 95
Minimum Mechanical Properties by ASTM A240 and ASME SA 240
Design Features - Stainless Steel 317L
Typical Applications - Stainless Steel 317L
Tensile Requirements - Stainless Steel 317L
合金317LMN and 317L are molybdenum-bearing austenitic stainless steel tube with greatly increased resistance to chemical attack as compared to the conventional chromium-nickel austenitic stainless steel pipe such as Alloy 304. In addition, 317LMN and 317L alloys offer higher creep, stress-to-rupture, and tensile strengths at elevated temperatures than conventional stainless steels. All are low carbon or "L" grades to provide resistance to sensitization during welding and other thermal processes.

The "M" and "N" designations indicate that the compositions contain increased levels of molybdenum and nitrogen respectively. The combination of molybdenum and nitrogen is particularly effective in enhancing resistance to pitting and crevice corrosion, especially in process streams containing acids, chlorides, and sulfur compounds at elevated temperatures. Nitrogen also serves to increase the strength of these alloys. Both alloys are intended for severe service conditions such as flue gas desulfurization (FGD) systems.

除了出色的耐腐蚀性和强度特性外,合金316、316L和317L CR-NI-MO合金还提供了极好的纤维性和外形能力,这是奥氏体不锈钢管的典型特征。
317L (1.4438) Heat Treatment
The recommended initial temperature range is 2100-2200°F (1150-1205°C) with a finishing range of 1700-1750°F (927-955°C).

Is Grade 317 Stainless Steel Worth the Cost Over 316 & 304?

With hundreds of different types of steel alloys on the market, it can be tough to find the perfect metal for your application. In many buying processes, the first consideration is the cost of the metal rather than the performance of the metal—which can be a serious mistake.

There are some cases where paying extra for a different, higher-performing alloy is necessary.

What Makes Grade 317 SS Different from 304 & 316 SS?


What separates 316 and 317 SS from 304 SS is that these higher-numbered alloys have added molybdenum in their formulation—grade 316 has about 2-3% molybdenum, and grade 317 has more than 3% molybdenum.


However, this added molybdenum content also influences the cost of these two alloys. Grade 317 SS is generally more expensive than grade 316 SS. 316 SS, in turn, is more expensive than grade 304 SS. The exact extra cost varies based on the market at the time.

When is 317 SS Worth the Extra Cost Over 316 SS?

For most strongly corrosive applications, grade 316 should be more than enough to resist frequent exposure.

但是,317的确比304或316具有更好的特定腐蚀性耐药性。如ATI金属出版物所述,在1%盐酸的沸腾测试溶液中,317 SS的腐蚀速率为542 Mils/年,316 SS以226密耳/年的腐蚀。317 SS在硫酸和氢氧化钠测试中也显着优于316 SS。

因此,如果您的过程涉及使用非常稀释(小于3-4%)的盐酸,轻度浓度(10%)硫酸或氢氧化钠(aka苛性钠苏打钠),那么317级无钢钢可能值得多余费用超过316或304 Ss。


Also, in the previously-cited chemical corrosion tests, 317 performed worse against some corrosives than 316, such as phosphoric acid (0.72 mils/year vs 0.2 mils/year) and acetic acid (0.48 mils/year vs 0.12 mils/year).


Also known as "marine grade" stainless steel due to its increased ability to resist saltwater corrosion compared to type 304. SS316 is often used for building nuclear reprocessing plants.

304/304L Stainless Steel





310s不锈钢has excellent resistance to oxidation under constant temperatures to 2000°F.


317L is a molybdenum bearing austenitic chromium nickel steel similar to type 316, except the alloy content in 317L is somewhat higher.



410 Stainless Steel

Type 410 is a martensitic stainless steel which is magnetic, resists corrosion in mild environents and has fairly good ductility.


2205双(不成功)S31803母材, or Avesta Sheffield 2205 is a ferritic-austenitic stainless steel.

双工2507(UNS S32750)

双工2507(UNS S32750)is a super duplex stainless steel with 25% chromium, 4% molybdenum..


UNS S32760 is described as a super duplex stainless with a microstructure of 50:50 austenite and ferrite.

SA 269

ASTM A269 / A269M Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service

SA 249 Stainless Steel

ASME SA 249 Standard Specification for Welded Austenitic Steel Boiler,
Superheater, Heat-Exchanger, and Condenser Tubes.

904L Stainless steel