Low temperature welding of Q355NH weathering steel

Q355NH weathering steel is used to manufacture containers, railway vehicles, oil derricks, port buildings, oil production platforms and containers containing hydrogen sulfide corrosive medium in chemical and petroleum equipment.

Welding of Q355NH weathering steel:
The allowable low ambient temperature of Q355NH weathering steel during welding is as follows:
1) Carbon steel and ordinary low alloy steel (grade A-I): - 10
2) Carbon steel, ordinary low alloy steel, heat resistant steel and alloy structural steel (Class A, class B, class C and B-I): 0
3) Heat resistant steel and alloy structural steel (class B and class C): 5

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