A333-6 low temperature steel pipe welding

A333-6 steel is a low-temperature steel. The minimum temperature of 70 ° C. Usually normalized or normalized and tempered state supplier.

A333-6 steel carbon content is lower, so hardened the tendency and cold cracking tendency are relatively small. Material toughness and ductility is better, generally difficult to produce hardening and cracks, good weldability, optional W707Ni electrode with El the imports of wire TGS 1N, using argon ITU welding. To ensure good toughness of welded joints.

A333-6 Chemical composition
 C  Mn  Si  S  P
 ≤0.120  0.290-1.060  ≥0.100  ≤0.058  ≤0.048
A333-6 Mechanical property
 tensile strength(Mpa)   yield strength(Mpa)  elongation(%)
 414  241  ≥16.5
Preheat

When the ambient temperature is below 5 ° C required weldment preheating. Preheat temperature of 100-150 oC: Preheat the scope of welds on each side of 100 mm; heating oxyacetylene flame (neutral flame) temperature measuring pen measuring the temperature at 50 ~ 100 mm from the center of the weld. The measurement points uniformly distributed, in order to better control the temperature.

Standards for Alloy pipes & tubes

ASTM A213 T91
ASTM A213M-09
Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
ASTM A333 Grade 6 alloy pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation.
ASTM A333
Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service and Other Applications.
ASTM A335 P22 is the part of ASTM A335, the pipe shall be suitable for bending, flanging, and similar forming operations, and for fusion welding.
ASTM A335
ASTM A335/ASME SA335 standard specication for seamless ferritic alloy-steel pipe for high-temperature service
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Alloy steel specification, Standard and identification

Alloy Steel pipe contains substantial quantities of elements other than carbon such as nickel, chromium, silicon, manganese, tungsten, molybdenum, vanadium and limited amounts of other commonly accepted elements such as manganese, sulfur, silicon, and phosphorous.

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ASTM A335 P11 alloy pipe


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