Steel 20-KS

Designation

Name	The value
Designation GOST Cyrillic	20-КС
Designation GOST Latin	20-KC
Transliteration	20-KS
By chemical elements	20-CoС

Description

Steel 20-KS is used: for the production of flat steel longitudinal electric-welded pipeline pipes with improved resistance to local corrosion with a diameter of 114−530 mm strength class K42 used for the construction of oil gathering networks (to transport corrosive gas, oil and formation water) and pipeline system at the pressure more than 7.4 MPa (75 kgf/cm²), for operation at a minimum ambient temperature of minus 60 °C.

Standards

Name	Code	Standards
Steel pipes and fittings to them	В62	TU 14-1-5433-2005

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	N	As	Al
TU 14-1-5433-2005	0.18-0.22	≤0.015	≤0.02	0.4-0.8	≤0.25	0.17-0.37	≤0.3	Rest	≤0.3	≤0.012	≤0.08	0.005-0.05

Fe is the basis.
According to TU 14-1-5433-2005, deviations from the chemical composition are permissible: for carbon ± 0.010%, for manganese ± 0.050%, for sulfur + 0.0010%, for phosphorus +0.0030%, for nitrogen +0.0030% , for niobium + 0.010%.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	KCU, kJ/m²
The main metal tube: heat-treated, in the state of delivery on the other 14-1-5433-2005. In the graph the impact strength values KCU-40/KCV-5
	≥245	≥410	≥20	≥294/294

Description mechanical marks

Name	Description
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	Limit short-term strength
d₅	Elongation after rupture
KCU	Toughness

Technological properties

Name	The value
Toughness	For the material of welded joints of pipes on the other 14-1-5433-2005 impact strength KCU-40 should be ≥ to 24.5 j/cm2 (245 kJ/m2).