Low-alloy structural steel for welded structures. History and Interesting.

Density of low-alloy structural steel
Welding of low-alloy structural steel
Annealing, hardening and heat treatment
Steel marking
Use of steel

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Technical characteristics

Weldability is determined by the ability to fuse, which is a prerequisite, but not sufficient in all cases. The main feature of weldability of steel is its ability to provide a welded joint without defects and, mainly, cracks. Well-welded structural steels can be welded under any normal production conditions without technological limitations and without any requirements for heat treatment of steel before and after welding, as well as for the thermal regime of welding.

Chemical composition

steel grade carbon silicon manganese chromium nickel molybdenum
25 0,20...0,30 0,17...0,37 0,50...0,80 ≤0,20 ≤0,30 -
15Г 0,10...0,20 ≤ 0,35 0,70...1,00 ≤0,20 ≤0,30 -
15Х 0,12...0,20 0,17...0,37 0,30...0,60 0,70-1,00 ≤0,40 -
20CG 0,15...0,25 0,17...0,37 0,90...1,20 0 90-1,20 ≤0,40 -
12CRNI2 ≤0,17 0,17...0,37 0,30...0,60 0,60-0,90 1,5 ...2,0 -
15NM 0,10...0,18 0,17...0,37 0,40...0,70 ≤ 0,30 1,5 ...2,0 0,20 ...0,30
12Х2Н4 ≤ 0,17 0,17...0,37 0,30...0,60 1,25-1,75 3,25...3,75 -

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Cast steel for welded structures

Properties are stipulated by GOST 977-85, and refer to the strength, fluidity and relative elongation of the metal of steel castings. The relevant standards are summarized in the table:

ultimate strength in MPa, no less yield strength, MPa, no less elongation, samples l=2.5d
400 - 20 25
450 - 18 23
500 - 15 19
550 - 12 15
600 - 10 12
400 200 24 30
450 230 22 27
500 250 19 24
550 280 16 20
600 300 12 15
400 230 28 35
450 270 25 31
500 290 22 27

A comparison of the chemical composition of all the above steels shows that very different chemical compositions of steels are subject to welding in the production of welded machine-building structures.

Buy. Supplier, Price.

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