Annealing, hardening and heat treatment of boiler steel

Density and specific heat capacity of boiler steel
Welding boiler steel
Annealing, hardening and heat treatment of boiler steel
Boiler steel marking
Boiler steel applications

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Relevance of boiler steel heat treatment

The initial level of mechanical properties of all boiler steel grades does not satisfy production, as they all belong to the group of low-carbon alloy steels, which have good plasticity and low hardness. Therefore, after rolling, such steel is subjected to heat treatment. The need for heat treatment is also caused by undesirable transformations in the microstructure of steels. In particular, unalloyed steel when heated to 350...450 ° C is prone to spontaneous spheroidization - the destruction of strong plates of iron carbide, and their subsequent disintegration into separate sites of spherical shape.

Types of heat treatment, GOST 5220-79

For sheets of hot-rolled steel grades 16K and 18K - normalization. At the request of the consumer steel sheets of these grades can be produced without normalization;

15K and 20K steel sheets are usually produced without normalization, but normalization may be provided at the customer's request;

Sheets of 22K steel grades up to and including 35 mm thick are manufactured without heat treatment or heat treated (HT), and over 25 mm thick - without heat treatment;

Sheets of low-alloy boiler steel are made without heat treatment or heat-treated, including those with rolling heating (TO); on customer's request normalization or hardening with TO tempering can be made;

Sheets of steel grades 17GS, 17GS1S all thickness, 10G2S1 grade plates more than 20 mm thick made only heat-treated (after normalization or quenching with tempering).

Evek GmbH offers to buy boiler steel at an affordable price in a wide range. We provide delivery of products to any point of the continent. The price is optimal.

Heat treatment mode of boiler steel

Steel grade Thickness of plate,
mm		 Yield strength ,
MPa

 Tensile strength, MPa Relative elongation, % Impact viscosity, J/cm at temperature, °С

Tensile strength after mechanical

Toughness after mechanical aging at +20 °С, J/cm

+20 -40 -70
not less
09G2S Up to 5 345 490 21 - - - -
From 5 to 10 345 490) 64 39 34 29
" 10 " 20 325 470 59 34 29
St. 20 " 32 " 305 460 59 34 29
" 32 " 60 " 285 450 59 34 29
" 60 " 80 " 275 440 59 34 29
" 80 " 160 " 265 430 59 34 29
10G2C1 To 5 355 490 21 - - - -
From 5 to 10 345 490 64 39 29 29
" 10 " 20 335 480 59 29 24
St. 20 " 32 " 325 470 59 29 24
" 32 " 60 " 325 450 59 29 24
" 60 " 80 " 295 430 59 29 24
" 80 " 100 " 295 430 59 29 24
16GS To 5 325 490 21 - - - -
From 5 to 10 325 490 59 39 29 29
" 10 " 20 315 480 59 29 24
St. 20 " 32 " 295 470 59 29 24
" 32 " 60 " 285 460 59 29 24
" 60 " 160 " 275 450 59 29 24
17GS To 5 345 510 23 - - - -
From 5 to 10 345 510 - 44 - 29
" 10 " 20 335 490 - 34 -
17G1S To 5 355 510 23 - - - -
From 5 to 10 355 - 44 - 29
" 10 " 20 345 - 39 -
14CGS

 Up to 5 345 490 22 - - - -
From 5 to 10 39 - 29
10 34 -

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