904L Stainless Steel Seamless Pipes and Tubes manufacturer-Saudi Arabia
أنابيب الفولاذ المقاوم للصدأ 904L سلس وأنابيب الصانع المملكة العربية السعودية
904L is a non-stabilised low carbon high alloy austenitic stainless steel. The addition of copper to this grade gives it greatly improved resistance to strong reducing acids, particularly sulphuric acid. It is also highly resistant to chloride attack – both pitting / crevice corrosion and stress corrosion cracking. This grade is non-magnetic in all conditions and has excellent weldability and formability. The austenitic structure also gives this grade excellent toughness, even down to cryogenic temperatures. 904L does have very substantial contents of the high cost ingredients nickel and molybdenum. Many of the applications in which this grade has previously performed well can now be fulfilled at lower cost by duplex stainless steel 2205 (S31803 or S32205), so it is used less commonly than in the past.
904L Stainless Steel Pipes and Tubes Product Range
904L Stainless Steel Pipes and Tubes Specifications: ASTM A/ASME SA 269/677 904L Stainless Steel Pipes and Tubes Sizes (Seamless): 1/2″ NB – 8″ NB
904L Stainless Steel Pipes and Tubes Sizes (ERW): 1/2″ NB – 24″ NB
904L Stainless Steel Pipes and Tubes Sizes (EFW): 6″ NB – 100″ NB
904L Stainless Steel Pipes and Tubes Wall Thickness available:
Schedule 5S – Schedule XXS (heavier on request)
904L Stainless Steel Pipes and Tubes Other Materials Testing:
NACE MR0175, H2 SERVICE, OXYGEN SERVICE, CRYO SERVICE, etc.
904L Stainless Steel Pipes and Tubes Dimensions:
All Pipes is manufactured and inspected/tested to the relevant standards including ASTM, ASME and API etc.
These properties are specified for flat rolled product (plate, sheet and coil) in ASTM B625. Similar but not necessarily identical properties are specified for other products such as pipe, tube and bar in their respective specifications.
Table 1. Composition ranges for 904L grade of stainless steels.
Table 2. Mechanical properties of 904L grade stainless steels.
|Grade||Tensile Strength (MPa) min||Yield Strength 0.2% Proof (MPa) min||Elongation (% in 50mm) min||Hardness|
|Rockwell B (HR B)||Brinell (HB)|
|Rockwell Hardness value range is typical only; other values are specified limits.|
Table 3. Typical physical properties for 904L grade stainless steels.
|Grade||Density (kg/m3)||Elastic Modulus (GPa)||Mean Co-eff of Thermal Expansion (Âµm/m/Â°C)||Thermal Conductivity (W/m.K)||Specific Heat 0-100Â°C (J/kg.K)||Elec Resistivity (nÎ©.m)|
|0-100Â°C||0-315Â°C||0-538Â°C||At 20Â°C||At 500Â°C|
Grade Specification Comparison
Table 4. Grade specifications for 904L grade stainless steels.
|Grade||UNS No||Old British||Euronorm||Swedish SS||Japanese JIS|
|These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted.|
Possible Alternative Grades
Table 5. Possible alternative grades to 904L stainless steel.
|Grade||Why it might be chosen instead of 904L|
|316L||A lower cost alternative, but with much lower corrosion resistance.|
|6Mo||A higher resistance to pitting and crevice corrosion resistance is needed.|
|2205||A very similar corrosion resistance, with the 2205 having higher mechanical strength, and at a lower cost to 904L. (2205 not suitable for temperatures above 300Â°C.)|
|Super duplex||Higher corrosion resistance is needed, together with a higher strength than 904L.|
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