DIN 1630 ST44.4 steel tubes/pipes are predominantly used in the construction of chemical plants, vessels, pipework and for general mechanical engineering purpose. The permissible working pressure shall not exceed 300°C.the ST44.4 steel tubes of DIN1630 are designed to meet high performance requirements. Normally , there are no limiting values for the maximum permission working pressure of DIN 1630 ST44.4 seamless steel tubes.
DIN1360 St 44.4 seamless steel pipe chemical composition
Chemical composition |
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|
Steel grade |
Type of deoxidation (RR.fully killed) |
Chemical composition, % by mass |
Addition of nitrogen fixing elements (e.g.no less than 0.020% Al total) |
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|
Symbol |
Material number |
C |
Si |
Mn |
P |
S |
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|
max |
max |
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|
St 44.4 |
1.0257 |
RR |
0.20 |
0.35 |
>=0.40 |
0.040 |
0.040 |
Yes |
DIN1360 St 44.4 seamless steel pipe mechanical property
Steel grade |
Upper yield stress Reh for wall thickness in mm |
Tensile strength Rm N/mm2 |
Elongation after fracture A5 |
Impact energy ISO V-notch test pieces at+20°C |
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|
Symbol |
Material number |
Up to 16 |
16-40 |
40-65 |
longitudinal |
transverse |
longitudinal |
transverse |
|
|
N/mm2 min |
% min |
/ min |
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|
St 44.4 |
1.0257 |
275 |
265 |
255 |
420 to 550 |
21 |
19 |
43 |
27 |
DIN1360 St 44.4 seamless steel pipe Specifications or Size:Out Diameter 12.5mm—824mm ；Wall Thickness : 2mm—100mm；Length: Random length, Fixed Length, SRL, DRL
Heat treatment:Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting
DIN1360 St 44.4 seamless steel pipe Surface treatment:PVC,black and color painting；Transparent oil,anti-rust oil；According to clients requirement
DIN1360 St 44.4 seamless steel pipe Finished goods condition:hot forging/hot rolling + annealing/normalizing + tempering/quenching + tempering/any conditions based on the customer's requirement
Payment : TT, LC,DP are all ok
Trade Terms : FOB / CFR /CIF
DIN1360 St 44.4 seamless steel pipe Delivery period: according to the material ,the standard, and the quantity of the contract.
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