Steel 40KHL
Designation
| Name |
The value |
| Designation GOST Cyrillic |
40ХЛ |
| Designation GOST Latin |
40XL |
| Transliteration |
40HL |
| The chemical elements |
40Cr |
Description
40KHL steel is used: for the manufacture of casting bandages, sections of the crown of the dumper, gears and other parts requiring high hardness; shaped castings of small size complex configuration, made by investment casting; casting parts high strength and work wear; hinged cast normal strength chains for rotary kilns used in cold area when the gas stream temperature of 200−500° C and a heat exchange device of rotary cement kilns; tsentrobezhnolityh pipes used as components in equipment for metallurgical, engineering, glass, ceramic, mining and processing petrochemical industry, and also intended for the manufacture of blanks and parts used in the composition of the products of aviation and the nuclear industry.
Standards
| Name |
Code |
Standards |
| Castings, steel |
В82 |
GOST 977-88, OST 24.920.01-80, OST 3-4365-79, TU 24-1-12-181-75 |
| Solid alloys, metal-ceramic products and powders, metal |
В56 |
OST 107.750001.001-91 |
| Classification, nomenclature and general norms |
В20 |
OST 84-218-85 |
| Pipes steel and connecting parts to them |
В62 |
TU 1333-003-76886532-2014 |
| Castings with special properties (cast iron and steel) |
В83 |
TU 4112-07507311-010-02 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Fe |
| TU 1333-003-76886532-2014 |
0.35-0.45 |
≤0.04 |
≤0.04 |
0.4-0.9 |
0.8-1.1 |
0.2-0.4 |
The rest |
Fe is the basis.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
Brinell hardness number, MPa |
| Hardening in air, 850-860 °C + vacation at 600-650 °C, air cooling |
| 100 |
≥491 |
≥638 |
≥12 |
≥25 |
≥392 |
196-229 |
| Normalization with 880-890 °C, air cooling up to 250-300 °C + aging 2 hours in a furnace at 250 °C + heat to 600-610 °C, air cooling + tempering in oil 870-880 °C + vacation at 630-640 °C, air cooling (named place of clippings sample) |
| 100 |
425-550 |
710-760 |
17-23 |
31-53 |
- |
167-229 |
| 200 |
390-440 |
710-760 |
17-21 |
28-48 |
- |
196-229 |
| 10 |
530-560 |
630-740 |
19-21 |
39-46 |
- |
206-229 |
| 100 |
405-540 |
700-730 |
20-24 |
35-47 |
- |
206-229 |
| 200 |
390-450 |
710-760 |
17-20 |
31-50 |
- |
206 |
| 30 |
510-530 |
690-740 |
13-23 |
33-51 |
- |
206-229 |
| 50 |
430-490 |
710-740 |
15-20 |
21-48 |
- |
206-229 |
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) |
| 0 |
219 |
85 |
7830 |
48 |
233 |
- |
- |
| 20 |
219 |
- |
7830 |
48 |
233 |
- |
- |
| 100 |
216 |
84 |
- |
46 |
270 |
122 |
491 |
| 200 |
210 |
81 |
- |
45 |
335 |
127 |
508 |
| 300 |
204 |
78 |
- |
42 |
435 |
131 |
525 |
| 400 |
185 |
71 |
- |
39 |
540 |
134 |
538 |
| 500 |
176 |
68 |
- |
35 |
665 |
138 |
567 |
| 600 |
164 |
63 |
- |
32 |
817 |
142 |
588 |
| 700 |
143 |
54 |
- |
28 |
975 |
146 |
626 |
| 800 |
132 |
50 |
- |
27 |
1115 |
118 |
701 |
| 900 |
- |
- |
- |
27 |
1195 |
118 |
701 |
| 1100 |
- |
- |
- |
- |
- |
126 |
689 |
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 and ESW. recommended heating and subsequent heat treatment. |
| Propensity to temper brittleness |
inclined |
| Flock-sensitive sensitivity |
insensitive |
| Workability by cutting |
In the hardened and tempered condition when NV 196-207 and blower SB=620 MPa Kn TV.SPL.=1.1 Kn b.St.=0.6 |
