What is 1.4438 stainless steel?
1.4438 stainless steel, also known as AISI 317L or X2CrNiMo18-15-4, is an austenitic chromium-nickel-molybdenum steel with excellent corrosion resistance, particularly in highly corrosive environments containing chlorides. Its high molybdenum content makes it resistant to reducing acids and chloride-containing media, leading to its widespread use in the chemical, petrochemical, and food industries, as well as in heat exchangers, pumps, and storage tanks.
What is 1.4438 stainless steel equivalent material?
The equivalent material to the European standard (EN) 1.4438 stainless steel is the American (AISI) 317L grade, also identified by its UNS designation S31703 and its chemical name X2CrNiMo18-15-4. This is an austenitic chromium-nickel-molybdenum stainless steel known for enhanced resistance to chemical attack due to its high content of these elements.
Equivalent
| ASTM | UNS | EN | DIN | JIS |
| 317 | S31700 | 1.4449 | X3CrNiMo18-12-3 | SUS317 |
| 317L | S31703 | 1.4438 | X2CrNiMo18-15-4 | SUS317L |
Chemical Properties:
| % | Cr | Ni | C | Si | Mn | P | S | Mo | Fe |
| 317 | min: 18.0 max:20.0 |
min: 11.0 max: 15.0 |
0.080 max |
0.75 max |
2.0 max |
0.04 max |
0.03 max |
min: 3 max: 4 |
balance |
| 317L | min: 18.0 max:20.0 |
min: 11.0 max: 15.0 |
0.035 max |
0.75 max |
2.0 max |
0.04 max |
0.03 max |
min: 3 max: 4 |
balance |
Mechanical Properties:
| Grade | Tensile Strength ksi (min.) |
Yield Strength 0.2% Offset ksi (min.) |
Elongation – % in 50 mm (min.) |
Hardness (Brinell) MAX |
Hardness (Rockwell B) MAX |
| 317 | 75 | 30 | 35 | 217 | 95 |
| 317L | 75 | 30 | 40 | 217 | 95 |
Corrosion Resistance
The higher molybdenum content of Alloy 317L assures superior general and localized corrosion resistance in most media when compared with 304/304L and 316/316L stainless steels. Environments that don't attack 304/304L stainless steel will normally not corrode 317L. One exception, however, are strongly oxidizing acids such as nitric acid. Alloys that contain molybdenum generally do not perform as well in these environments.
Welding
Grade 317 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.
Hot Working
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.
What is the difference between 317 and 317L?
Stainless steel grade 317L is a low carbon version of grade 317 stainless steel. It has the same high strength and corrosion resistance as 317 steel but can produce stronger welds due to the low carbon content.
who choose us?
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