Super austenitic stainless steel tube
Product size:
Hot extrusion tube: OD 48-325mm, WTK 4-40mm
Cold rolling tube: OD 5.8-508mm, WTK 0.3-35mm
Product standard:
ASTM A312
ASME SB677
Product condition:
hot extrusion
cold rolling
heat treatment
Chemical composition of main grade, (%)
ASTM GRADE C Cr Ni Mo Cu Fe Si Mn S P N
N08904 904L ≤0.02 19-23 23-28 4-5 1-2 rem ≤1.00 ≤2.00 ≤0.035 ≤0.045 --
N08637 AL-6XN ≤0.03 20-22 23.5-25.5 6-7 ≤0.75 rem ≤1.00 ≤2.00 ≤0.04 ≤0.04 0.18-0.25
S31254 254SMo ≤0.02 19.5-20.5 17.5-18.5 6-6.5 0.5-1.0 rem ≤0.8 ≤1 ≤0.01 ≤0.03 0.18-0.22
S32654 654SMo ≤0.02 24-25 21-23 7-8 0.3-0.6 rem ≤0.3 2-4 ≤0.005 ≤0.03 0.45-0.55
N08926 1.4529 ≤0.02 19-21 24-26 6-7 0.5-1.5 rem ≤0.5 ≤1 ≤0.01 ≤0.03 0.15-0.25
Room-temperature mechanical property
ASTM UNS heat-treatment temperature Rm,min,MPa Rp0.2%,min,MPa A50,min,%
N08904 ≥1100℃ 490 220 35
N08637 ≥1100℃ 690 310 30
S31254 ≥1150℃ 675 310 35
S32654 ≥1150℃ 750 430 35
N08926 ≥1120℃ 270 600 35
Intergranular corrosion resistance
Intergranular corrosion resistance according ASTM 28A (ferric sulfate-sulfuric acid method)
ASTM UNS condition time(h) corrosion rate(mm/a) corrosion depth(µm)
N08904 solution 120 0.35 ≤50
Intergranular corrosion resistance according ASTM 262C (65%HNO3)
ASTM UNS condtion 48h(1) 48h(2) 48h(3) 48h(4) 48h(5) average corrosion rate(mm/a)
N08904 solution 0.19 0.18 0.29 0.48 0.67 0.36
 
Usage
Urea stainless tube---Applied in manufacturing the devices as air stripping tower, high pressure separator, CO2 compressor cooling tower and high pressure piping, etc.
Product standard for urea stainless steel: ASME SA-213 ASTM A213 JIS G3463, etc.
Product size:
OD 16-219mm
WTK 1-20mm
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