Steel 03KH16N15M3B (026Х16Н15М3Б; ЭИ844Б)

Designation

Name	The value
Designation GOST Cyrillic	03Х16Н15М3Б
Designation GOST Latin	03X16H15M3B
Transliteration	03H16N15M3B
By chemical elements	03Cr16Н15Mo3Nb

Name	The value
Designation GOST Cyrillic	026Х16Н15М3Б
Designation GOST Latin	026X16H15M3B
Transliteration	026H16N15M3B
By chemical elements	026Cr16Н15Mo3Nb

Name	The value
Designation GOST Cyrillic	ЭИ844Б
Designation GOST Latin	EI844B
Transliteration	EhI844B
By chemical elements	-

Description

03KH16N15M3B steel is used: for the manufacture of a tube blank; extremely thin-walled pipes of high precision; profile rolling of high accuracy; welded constructions working in the conditions of action of the boiling phosphoric, sulfuric, 10% acetic acid and sulfuric acid media intended for long-term service at operating temperatures to +600 °C.

Note

High-temperature corrosion-resistant austenitic steel.

Standards

Name	Code	Standards
Classification, nomenclature and General rules	В30	GOST 5632-72
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 14-1-1641-75
Bars and shapes	В32	TU 14-11-245-88
Steel pipes and fittings to them	В62	TU 14-3-219-89, TU 14-3-550-90

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	N	V	Ti	Mo	Nb	W	Co
TU 14-3-219-89	≤0.026	≤0.015	≤0.02	≤0.8	15-17	≤0.6	14-16	Rest	-	≤0.05	-	-	2.5-3	0.25-0.5	-	≤0.02
GOST 5632-72	≤0.03	≤0.015	≤0.02	≤0.8	15-17	≤0.6	14-16	Rest	≤0.3	-	≤0.2	≤0.2	2.5-3	0.25-0.5	≤0.2	-
TU 14-1-1641-75	0.016-0.026	≤0.01	≤0.01	0.5-0.9	16-17	≤0.5	15-16	Rest	-	≤0.015	0.05-0.25	-	2.5-3	0.25-0.45	-	-

Fe is the basis.
According to TU 14-3-219-89, the chemical composition is specified for steel grade 026H16N15M3B (EI844B).
According to GOST 5632-72, the chemical composition is specified for steel grade 03H16N15M3B (EI844B).
According to TU 14-1-1641-75, the chemical composition is indicated for steel grade 026H16N15MZBU-ID (EI844BU-ID). Deviation according to the chemical composition is allowed: for carbon -0.0040%, for nitrogen + 0. 0050%, for phosphorus +0.0050%. The impurity content should be: cobalt ≤0.005%, copper ≤0.050%, arsenic ≤0.0050%, lead ≤ 0.00050%, cadmium ≤ 0.00050%, tin ≤0.0010%, aluminum ≤0.10%, zinc ≤0.0010%, antimony ≤0.0010%, bismuth ≤ 0.00050%, tantalum ≤0.0050%, titanium ≤0.050%, boron ≤0.0020%. At the same time, deviations in chemical composition are allowed: by the content of tantalum +0.0050%, by the content of cobalt +0.0050%, by the content of titanium +0.050%.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %
Tubular billet on the other 14-1-1641-75. Austenization at 1030-1100 °C (aging for 1 h), cooling in air or in water
20-25	-	≥490	≥46
20-25	≥127	≥340	≥35

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

Technological properties

Name	The value
Weldability	Without restrictions.
Macrostructure and pollution	In the macrostructure of the workpiece on the other 14-1-1641-75 in the state of delivery should be free of cracks, gas bubbles, subcortical bubbles, turns brown, bundles, traces of shrinkage, niobium scabs and slag inclusions visible to the naked eye. Layer-by-layer crystallization and the square of the increased travelmasti are not rejection symptom. Under the control of the workpiece on the transverse microtemplate allowed: Central porosity - less than 1 point, point heterogeneity - not more than 1 score; - square of phase separation is not more than 1 score. In metal non-metallic inclusions shall not exceed the maximum score: - sulfides - 1.0 points; - stroke nitrides and carbonitrides - 2.0 points; - point nitrides and carbonitrides - 2.0 points. The total number of stroke and point nitrides and carbonitrides on each sample must not exceed 3 points. The total number of oxygen inclusions (granules and globules of oxides, spinels, silicates and silicate glasses) shall not exceed: a) from 1 to 2 inclusive divisions of the ocular scale in 2 sections - 50 inclusions on 6 sections - 150 inclusions; b) from 2 to 3 inclusive divisions of the ocular scale in 2 sections - 1 for on, - for 6 sections - 3 inclusions; C) larger than 3 divisions of the ocular scale are not allowed.
Corrosion resistance	03KH16N15M3B steel has higher resistance to pitting than steel 0ЗХ17Н14М3. Tubular billet on the other 14-1-1641-75 must be able to withstand the test of intercrystalline corrosion. Test for intergranular corrosion is performed on 2 samples according to GOST 6032 method AM 24, provoking a vacation at a temperature of 650° - 2 hours.