FIELD: metallurgy.
SUBSTANCE: steel contains the following, wt %: carbon 0.46-0.50, manganese 0.65-0.85, silicone 0.17-0.37, sulphur ≤0.030, phosphorus ≤0.030, copper ≤0.30, nickel ≤0.30, chrome ≤0.30, aluminium 0.01-0.06, and iron is the rest. Manufactured pipes have a ferrite-pearlite structure throughout the cross-section, and the following conditions are met for steel components: [copper]+[nickel]+[chrome]=0.25-0.90% and [carbon]+[manganese/6]+[silicone/24]≥0.58%.
EFFECT: providing the required mechanical properties in a state after hot deformation and in a state after heat treatment.
2 dwg, 3 tbl
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Authors
Dates
2015-09-27—Published
2013-07-30—Filed