Grade 904L SMLS Stainless Steel Seamless Pipe
904L(1.4539) SEAMLESS&WELDED PIPE
904L is an austenitic stainless steel.In comparison to 316L, its
molybdenum addition gives it superior resistance to localized
attack (pitting and crevice corrosion) by chlorides and greater
resistance reducing acids and in particular its copper addition
gives it useful corrosion resistance to all concentrations of
sulphuric acid. Its high alloying content also gives it greater
resistance to chloride stress corrosion cracking, but it is still
susceptible. Its low carbon content makes it resistant to
sensitization by welding and which prevents intergranular
corrosion.
STOCKING PROGRAM
- Size Range : 1/4″ ~ 36″ NPS (Larger sizes available upon request)
- Schedules : 10, 10s, 40, 40s, 80, 80s, 120, 160 (Custom wall
thicknesses available upon request)
- Stainless Steel Grades : 304, 304L, 316, 316L, 316L, 317L, 321 ,
347
- Special Alloys : 2205, 254SMo, Monel, Inconel
- Chrome Moly : P5, P9, P11, P22, P91
- Standards : ASTM / ASME
CHEMICAL COMPOSITION
Element | Cu | Mn | Cr | Ni | P | S | Si |
904L | 1.0~2.0% | 2.00% | 19.0~23.0% | 23.0~28.0% | 0.045% | 0.035% | 1.00% |
MECHANICAL PROPERTIES
Grade | Tensile Strength (MPa) Min | Yield Strength 0.2% proof (MPa) Min | Elongation (%in 50mm) Min | Rockwell B(HRB) |
904L | 490 | 220 | 36 | 70~90 |
ADVANTAGES OF WELDED
- Welded pipes are typically more cost effective than their seamless
equivalents.
- Welded pipes are usually more readily available than seamless. The
longer lead time required for seamless pipes can not only make
timing problematic, but it also allows more time for the price of
the materials to fluctuate.
- The wall thickness of welded pipes is generally more consistent
than that of seamless pipes.
- The internal surface of welded tubes can be checked before
manufacturing, which isn’t possible with seamless.
ADVANTAGES OF WELDED
- The main perceived advantage of seamless pipes is that they don’t
have a weld seam.
- Seamless pipes provide peace of mind. Although there should be no
issues with the seams of welded pipes supplied by reputable
manufacturers, seamless pipes prevent any possibility of a weak
seam.
- Seamless pipes have better ovality or roundness, than welded pipes.