Steel 12KH18N9 (Х18Н9)

Designation

Name The value
Designation GOST Cyrillic 12Х18Н9
Designation GOST Latin 12X18H9
Transliteration 12H18N9
By chemical elements 12Cr18Н9
Name The value
Designation GOST Cyrillic Х18Н9
Designation GOST Latin X18H9
Transliteration H18N9
By chemical elements Cr18Н9

Description

12KH18N9 steel is used: for the manufacture of chemical equipment; various items and structures made of sheet and strip, welded by spot welding, pipes and parts thereof; parts of aircraft; products subjected to heat treatment (tempering); the wire woven grids with square cells of micron size, used for control and separation of materials by particle size, filtration of liquids, gases and other purposes.

Note

Steel corrosion and heat-resistant.
Unstabilized chromium-Nickel steel of austenitic class.
The recommended maximum operating temperature for a long time +800 °C.
Temperature intense scaling in air +850 °C.
Steel is unstable in sulfur-containing environments and is used when cannot be applied, Nickel-free steel.

Standards

Name Code Standards
Sheets and strips В23 GOST 103-2006
Bars and shapes В22 GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Test methods. Packing. Marking В09 GOST 11878-66
Wire, steel, alloy В73 GOST 18143-72, TU 14-4-1068-80
Processing of metals by pressure. Forgings В03 GOST 25054-81, ST ЦКБА 010-2004
Sheets and strips В33 GOST 4405-75, GOST 5582-75, GOST 7350-77, TU 108-930-80, TU 14-105-451-86, TU 14-1-1517-76, TU 14-1-1749-76, TU 14-1-1750-76, TU 14-1-2186-77, TU 14-1-2476-78, TU 14-1-3199-81, TU 14-1-4780-90
Tape В34 GOST 4986-79, TU 3-880-84, TU 14-1-1370-75, TU 14-1-3166-81, TU 14-1-4606-89, TU 14-1-4664-89, TU 14-1-3386-82
Classification, nomenclature and General rules В30 GOST 5632-72
Bars and shapes В32 GOST 5949-75, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 18907-73, TU 14-1-1534-76, TU 14-1-1966-77, TU 14-1-2972-80, TU 14-1-377-72, TU 14-1-3957-85, TU 14-11-245-88, TU 14-1-1271-75
Steel pipes and fittings to them В62 GOST 9940-81, GOST 9941-81, GOST 14162-79, TU 14-3-1406-86, TU 14-3-1654-89
Blanks. Of the workpiece. Slabs В21 OST 1 90176-75
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-565-84
Thermal and thermochemical treatment of metals В04 STP 26.260.484-2004, ST ЦКБА 016-2005
Mesh metal В76 TU 14-4-507-99

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
TU 108-930-80 ≤0.12 ≤0.02 ≤0.035 ≤2 17-19 ≤0.8 8-10 Rest ≤0.5 ≤0.2 ≤1 ≤0.5 ≤0.2
GOST 5632-72 ≤0.12 ≤0.02 ≤0.035 ≤2 17-19 ≤0.8 8-10 Rest ≤0.4 ≤0.2 ≤0.5 ≤0.5 ≤0.2
Fe is the basis.
For aircraft components, the Mo content is ≤ 0.30%.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % d4 d y, % HB, MPa
Blank pieces of pipe fittings according to ST CKBA 016-2005. Annealing in air 1020-1100 °C (aging of 1.0 to 1.5 min/mm of maximum cross section but not less than 0.5 h)
≤60 ≥196 ≥490 ≥45 - - ≥55 121-179
A sample with a diameter of 10 mm and a length of 50 mm, laminated. The rate of deformation of 1.1 mm/min strain Rate of 0.0004 1/s
- - ≥210 ≥47 - - ≥76 -
Blank pieces of pipe fittings according to ST CKBA 016-2005. Annealing in air 1020-1100 °C (aging of 1.0 to 1.5 min/mm of maximum cross section but not less than 0.5 h)
60-200 ≥196 ≥490 ≥40 - - ≥48 121-179
A sample with a diameter of 10 mm and a length of 50 mm, laminated. The rate of deformation of 1.1 mm/min strain Rate of 0.0004 1/s
- - ≥120 ≥57 - - ≥70 -
Blank pieces of pipe fittings according to ST CKBA 016-2005. Annealing in air 1020-1100 °C (aging of 1.0 to 1.5 min/mm of maximum cross section but not less than 0.5 h)
200-300 ≥196 ≥490 ≥38 - - ≥45 121-179
A sample with a diameter of 10 mm and a length of 50 mm, laminated. The rate of deformation of 1.1 mm/min strain Rate of 0.0004 1/s
- - ≥68 ≥65 - - ≥66 -
Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79 on delivery
0.2-2 - ≥1130 - ≥3 - - -
A sample with a diameter of 10 mm and a length of 50 mm, laminated. The rate of deformation of 1.1 mm/min strain Rate of 0.0004 1/s
- - ≥38 ≥56 - - ≥60 -
Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79 on delivery
0.2 - ≥1130 - ≥2 - - -
A sample with a diameter of 10 mm and a length of 50 mm, laminated. The rate of deformation of 1.1 mm/min strain Rate of 0.0004 1/s
- - ≥30 ≥64 - - ≥59 -
Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79 on delivery
0.2-2 - ≥980 - ≥5 - - -
A sample with a diameter of 10 mm and a length of 50 mm, laminated. The rate of deformation of 1.1 mm/min strain Rate of 0.0004 1/s
- - ≥16 ≥45 - - ≥71 -
Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79 on delivery
0.2 - ≥980 - ≥3 - - -
Rolled steel. Annealing in air from 1080 °C
- ≥230 ≥560 ≥46 - - ≥66 -
Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79 on delivery
0.2-2 - ≥780 - ≥15 - - -
Rolled steel. Annealing in air from 1080 °C
- ≥180 ≥450 ≥36 - - ≥68 -
Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79 on delivery
0.2 - ≥780 - ≥8 - - -
Rolled steel. Annealing in air from 1080 °C
- ≥160 ≥420 ≥29 - - ≥66 -
Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79. Quenching in water or air from 1050-1080 °C (samples)
0.2-2 - ≥530 - ≥35 - - -
Rolled steel. Annealing in air from 1080 °C
- ≥150 ≥420 ≥26 - - ≥61 -
Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79. Quenching in water or air from 1050-1080 °C (samples)
0.2 - ≥530 - ≥18 - - -
Rolled steel. Annealing in air from 1080 °C
- ≥140 ≥400 ≥30 - - ≥60 -
Sheet full hard GOST 5582-75. Without heat treatment
≤3.9 - 930-1230 ≥13 - - - -
Rolled steel. Annealing in air from 1080 °C
- ≥140 ≥390 ≥31 - - ≥61 -
Hot rolled sheet (of 1.5-3.9 mm) and cold rolled (0,7-3,9 mm) steel according to GOST 5582-75. Quenching in water or air from 1050-1080 °C
- ≥195 ≥540 ≥38 - - - -
Rolled steel. Annealing in air from 1080 °C
- ≥120 ≥350 ≥28 - - ≥51 -
Hot rolled sheet (4,0-50,0 mm) and cold rolled (4,0-5,0 mm) steel according to GOST 7350-77. Quenching in water or under a water shower with 1050-1120 °C
- ≥215 ≥530 ≥38 - - - -
Rolled steel. Annealing in air from 1080 °C
- ≥120 ≥280 ≥27 - - ≥52 -
Forgings <1000mm. Quenching in air, oil or water from 1050-1100 °C
≥196 ≥490 ≥35 - - ≥40 -
Rolled steel. Annealing in air from 1080 °C
- ≥120 ≥270 ≥20 - - ≥40 -
The wire is heat-treated in the delivery condition according to GOST 18143-72 (elongation, % at rated sample length of 100 mm is specified for the wire of the 1st class in brackets are for 2nd class)
0.2-1 - 590-880 - - ≥25 (≥20) - -
1.1-6 - 510-830 - - ≥25 (≥20) - -
Cold drawn wire in the delivery state according to GOST 18143-72
0.2-3 - 1130-1470 - - - - -
3.4-6 - 1080-1420 - - - - -
Bars of polished, processed on a given strength (TS) according to GOST 18907-73
1-30 - 640-880 - - ≥20 - -
Bars hot rolled and forged according to GOST 5949-75. Quenching in air, oil or water from 1050-1100 °C
≥196 ≥490 ≥45 - - ≥55 -
Pre-painted steel sheet heat-treated (softening) on the other 14-1-3199-81
0.5-3 ≥274.4 ≥539 ≥40 - - - -
Tubes in the delivery condition, without heat treatment (specified wall thickness of pipe)
3.5-32 - ≥529 ≥40 - - - -
0.2-22 - ≥549 ≥37 - - - -
Forming at OST 1 90176-75. Quenching in air, oil or water from 1050-1100 °C
≥196 ≥540 ≥45 - - ≥60 -

Description mechanical marks

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
d4 Elongation after rupture
d Elongation after rupture
y The relative narrowing
HB Brinell hardness number

Physical characteristics

Temperature Е, HPa G, HPa r, kg/m3 l, W/(m · °C) R, Mr. · m a, 10-6 1/°C С, J/(kg · °C)
0 199 77 7900 - - - -
20 205 - 7900 15 725 - -
100 202 - 7860 16 743 165 504
200 197 - 7820 18 819 172 -
300 190 - 7780 19 891 177 504
400 181 - 7740 20 851 181 -
500 173 - 7690 22 1001 183 -
600 160 - 7650 23 1048 186 -
700 150 - 7600 25 1098 189 -
800 - - 7560 26 1140 193 -
900 - - 7510 - - 193 -
1000 - - - - - 197 -
1200 - - - - - 202 -

A description of the physical symbols

Name Description
Е The normal elasticity modulus
r Density
l Coefficient of thermal conductivity
R UD. the resistivity
a The coefficient of linear expansion
С Specific heat

Technological properties

Name The value
Weldability Without restrictions. Welded joints made by other methods, in addition to spot welding, prone to intergranular corrosion. To increase the resistance to brittle destruction in kolosovo the zone of the welded joints operating at temperatures above 500 °C welded assemblies are subjected to tempering in air 970-1020 °C (aged for at least 2.5 minutes/mm of maximum wall thickness, but not less than 1 hour). In the presence of hard surfacing in welded assemblies to produce a stabilizing annealing at a temperature of 950-980 °C (aged for at least 2 h), cooling with the furnace or with the furnace to 300 °C and then in air. To relieve residual stresses of welded assemblies, complex configuration, apply leave in 585-615 °C with air cooling, if the temperature of the product does not exceed 500 °C.
The temperature of forging Start - 1200 °C, the end - 850 °C. the cross Sections up to 350 mm cooled in air.
Macrostructure and pollution Macrostructure of steel shall be no traces of shrinkage, delamination, foreign inclusions.
Features of heat treatment Steel used for products, not subjected to welding is designed to work in environments do not cause intergranular corrosion. To increase the resistance against General corrosion and eliminate the tendency to intergranular corrosion and to improve the ductility of the workpiece material is subjected to annealing regime: heating to 1050-1100 °C, cooling in water. The holding time at the heating for hardening to products with a wall thickness up to 10 mm - 30 min, over 10 mm - 20 min + 1 min per 1 mm maximum thickness.
Corrosion resistance The steel should not have the tendency to intergranular corrosion.