Steel 20KH13L
Designation
| Name |
The value |
| Designation GOST Cyrillic |
20Х13Л |
| Designation GOST Latin |
20X13L |
| Transliteration |
20H13L |
| The chemical elements |
20Cr13 |
Description
20KH13L steel is used: for the manufacture of castings parts exposed to impact loads (turbine blades, valves, hydraulic presses, valves cracking units, segments, nozzles, moulds for glass, frames sedimentary Windows, household items, etc.), and products that are exposed to relatively weak aggressive media (precipitation, wet steam, aqueous solutions of salts of organic acids at room temperature); casting parts for gas turbines and axial compressors operating at temperatures to +540 °C; tsentrobezhnolityh pipes intended for the manufacture of the coils of the tubular furnace installations production of ammonia, hydrogen, ethylene, carbon disulphide, etc., operating in the temperature range 760−1060 °C and a pressure of 3.92 MPa (40 kgf/cm2); casting equipment parts (valves) for nuclear power stations, heat supply stations, heat and power plants, experimental and research nuclear reactors and installations; casting investment casting for aircraft industry group I — loaded items with the specific requirements for density and mechanical properties: high load brackets, sealed the housing, the frames of gyroscopes, stabilizers, etc. and group II — non-loaded and lightly loaded parts, rings, flanges, fittings, leaking instrument cabinets, etc.
Note
Corrosion resistant steel heat-resistant martensitic class. If the steel 20KH13L used as high-temperature, the maximum operating temperature details 500 °C.
Steel 20KH13L somewhat less corrosion resistant in atmospheric conditions compared with steel stamps 15KH13L. The higher corrosion resistance of steel is achieved by heat treatment and polishing.
Standards
| Name |
Code |
Standards |
| Castings with special properties (cast iron and steel) |
В83 |
GOST 2176-77 |
| Castings, steel |
В82 |
GOST 977-88, OST 108.961.04-80, OST 24.920.01-80, OST 3-4365-79, OST 1 80059-83, TU 26-02-19-75, TU 4112-091-00220302-2006, TU 5.961-11151-92 |
| Solid alloys, metal-ceramic products and powders, metal |
В56 |
OST 107.750001.001-91 |
| Welding and cutting of metals. Soldering, riveting |
В05 |
RTM 108.020.122-78 |
| Thermal and thermochemical treatment of metals |
В04 |
STP 26.260.484-2004 |
| Pipes steel and connecting parts to them |
В62 |
TU 1333-047-00220302-02 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
| TU 5.961-11151-92 |
0.16-0.25 |
≤0.025 |
≤0.03 |
0.3-0.8 |
12-14 |
0.2-0.8 |
- |
The rest |
- |
| GOST 2176-77 |
0.15-0.25 |
≤0.025 |
≤0.03 |
0.3-0.8 |
12-14 |
0.2-0.8 |
≤0.5 |
The rest |
≤0.3 |
Fe is the basis.
According to GOST 977-88, when steel is smelted in an induction furnace, a mass fraction of sulfur can be increased to 0.030%.
According to TU 5.961-11151-92 for castings of grades 1 and 2 the mass fraction of cobalt in steel should not exceed 0.20%, and for castings in the direct irradiation zone - 0.15%.
According to GOST 2176-77 the chemical composition is given for steel grade 20X13L. Deviations from the norms of chemical composition are allowed: for carbon ± 0.020%; for silicon ± 0.10%; on manganese, copper, chromium and nickel ± 0.10% each; by titanium and tungsten ± 0.050% each; by vanadium, molybdenum and niobium ± 0.020% each.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
Brinell hardness number, MPa |
| Normalization at 940-950 °C + Vacation at 740-750 °C, air cooling (named place of clippings sample) |
| 100 |
440-505 |
630-690 |
21-27 |
40-63 |
- |
187-206 |
| The castings are supplied according to GOST 2176-77 |
| - |
≥441 |
≥589 |
≥16 |
≥40 |
≥392 |
- |
| Castings with wall thickness up to 100 mm in the delivery state on the other 5.961-11151-92. Annealing at 940-960 °C, cooling with furnace + Quenching in oil with 1040-1060 °C + Vacation at 740-760 °C, air cooling |
| - |
≥450 |
≥600 |
≥6 |
≥40 |
≥392 |
- |
| Normalization at 940-950 °C + Vacation at 740-750 °C, air cooling (named place of clippings sample) |
| 200 |
495-570 |
640-730 |
12-17 |
19-41 |
- |
- |
| Casting parts of gas turbines. Quenching in oil with 1050 °C + Vacation at 740-760 °C, air cooling |
| - |
≥441 |
≥589 |
≥14 |
≥35 |
≥290 |
201-241 |
| Castings with wall thickness up to 100 mm in the delivery state on the other 5.961-11151-92. Annealing at 940-960 °C, cooling with furnace + Quenching in oil with 1040-1060 °C + Vacation at 740-760 °C, air cooling |
| - |
≥360 |
- |
- |
- |
- |
- |
| Casting for STP 26.260.484-2004. Quenching in oil 1000-1050 °C + Vacation at 720-750 °C, air cooling |
|
≥450 |
≥600 |
≥16 |
≥40 |
≥392 |
- |
| Normalization at 940-950 °C + Vacation at 740-750 °C, air cooling (named place of clippings sample) |
| 10 |
390-460 |
610-680 |
22-28 |
51-64 |
- |
- |
| Castings with wall thickness up to 100 mm in the delivery state on the other 5.961-11151-92. Annealing at 940-960 °C, cooling with furnace + Quenching in oil with 1040-1060 °C + Vacation at 740-760 °C, air cooling |
| - |
≥340 |
- |
- |
- |
- |
- |
| Normalization at 940-950 °C + Vacation at 740-750 °C, air cooling (named place of clippings sample) |
| 100 |
430-500 |
630-670 |
22-27 |
45-61 |
- |
187-206 |
| Castings with wall thickness up to 100 mm in the delivery state on the other 5.961-11151-92. Annealing at 940-960 °C, cooling with furnace + Quenching in oil with 1040-1060 °C + Vacation at 740-760 °C, air cooling |
| - |
≥320 |
- |
- |
- |
- |
- |
| Normalization at 940-950 °C + Vacation at 740-750 °C, air cooling (named place of clippings sample) |
| 200 |
540-570 |
680-710 |
10-14 |
20-30 |
- |
- |
| Casting a cross section of 30 mm. Normalization at 940-950 °C + Vacation at 740-750 °C, air cooling |
| - |
385-455 |
560-630 |
21-23 |
57-66 |
- |
- |
| Normalization at 940-950 °C + Vacation at 740-750 °C, air cooling (named place of clippings sample) |
| 30 |
415-500 |
620-670 |
18-30 |
61-64 |
- |
196-206 |
| Casting a cross section of 30 mm. Normalization at 940-950 °C + Vacation at 740-750 °C, air cooling |
| - |
355-445 |
520-600 |
18-22 |
55-65 |
- |
- |
| Normalization at 940-950 °C + Vacation at 740-750 °C, air cooling (named place of clippings sample) |
| 50 |
385-460 |
610-650 |
15-29 |
22-67 |
- |
187-206 |
| Casting a cross section of 30 mm. Normalization at 940-950 °C + Vacation at 740-750 °C, air cooling |
| - |
360-395 |
510-540 |
17-19 |
51-62 |
- |
- |
| - |
335-405 |
470-530 |
14-19 |
51-61 |
- |
- |
| - |
300-380 |
390-465 |
14-20 |
52-64 |
- |
- |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
| kJ/m2 |
Toughness |
Physical characteristics
| Temperature |
Е, ГПа |
G, ГПа |
r, кг/м3 |
l, Вт/(м · °С) |
R, НОм · м |
a, 10-6 1/°С |
С, Дж/(кг · °С) |
| 20 |
222 |
87 |
7740 |
21 |
645 |
- |
- |
| 100 |
216 |
84 |
- |
23 |
695 |
10 |
470 |
| 200 |
211 |
82 |
- |
24 |
775 |
108 |
491 |
| 300 |
203 |
79 |
- |
25 |
859 |
113 |
512 |
| 400 |
195 |
76 |
- |
26 |
931 |
117 |
533 |
| 500 |
184 |
71 |
- |
27 |
985 |
121 |
563 |
| 600 |
167 |
64 |
- |
27 |
1055 |
124 |
596 |
| 700 |
149 |
55 |
- |
27 |
1115 |
126 |
643 |
| 800 |
140 |
53 |
- |
28 |
1125 |
128 |
680 |
| 900 |
- |
- |
- |
28 |
1160 |
128 |
680 |
| 1100 |
- |
- |
- |
- |
- |
108 |
693 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
Technological properties
| Name |
The value |
| Weldability |
Limited weldability. Welding methods: SMAW, ADS under gas protection. Preheating and heat treatment are applied depending on weld type and purpose of construction. |
| Workability by cutting |
If HB >=170 Kn TV.SPL.=1,2 Kn b.St.=0,5. |
| Features of heat treatment |
Steel products can be subjected to hardening, leave, annealing. The quenching and tempering of the products is done to achieve: a) maximum corrosion resistance; b) the specified level of mechanical properties. Steel castings 20KH13L can be subjected to heat treatment by two regimes: a) annealing at 950 °C, exposure of 2-3 h, air cooling; b) quenching in oil 1000-1050 °C, 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 of maximum thickness + vacation at 720-750 °C, exposure for 1-2 h, air cooling. |
| Defect welding |
Welding defects of castings after cutting is carried out with preliminary and attendant heating to 400-450 °C. Welding defects by manual welding is done with electrodes type e-06Х13Н (GOST 10052) brand CL-41. |
