Steel ВСт6сп
Description
Steel ВСт6сп
Steel ВСт6сп: marochnik steels and alloys. Below the systematized information on the purpose, chemical composition, types of supplies, substitutes, temperature of critical points physical, mechanical, technological and casting properties of the brand — Steel ВСт6сп.
General information steel ВСт6сп
| Substitute brand |
| steel ВСт5сп |
| Delivery type |
| Long products, including shapes: GOST 2590−71, 2591−71 GOST, GOST 2879−69, GOST 8509−86, GOST 8510−86, 8239−72 GOST, GOST 8240−72, 535−79 GOST, GOST 380−71. A thick sheet of GOST 19903−74. Strip, GOST 103−76, GOST 82−70, GOST 535−79. Pipe GOST 8734−75. |
| Application |
| For details high tensile strength: axes, shafts, fingers, pistons and other parts in heat-treated condition as well as for rod of rebar periodic profile. |
Chemical composition of steel ВСт6сп
| Chemical element |
% |
| Silicon (Si) |
0.15−0.35 |
| Manganese (Mn) |
0.50−0.80 |
| Copper (Cu), not more |
0.30 |
| Arsenic (As), not more |
0.08 |
| Nickel (Ni), not more |
0.30 |
| Sulfur (S), not more |
0.05 |
| Carbon (C) |
0.38−0.49 |
| Phosphorus (P), not more |
0.04 |
| Chromium (Cr), not more |
0.30 |
Mechanical properties of steel ВСт6сп
Mechanical properties at elevated temperatures
| t test,°C |
σ0,2, MPa |
σB, MPa |
δ5, % |
ψ, % |
KCU, j/m2 |
| Rental |
| 20 |
325 |
535 |
25 |
52 |
63 |
| 100 |
305 |
505 |
20 |
53 |
71 |
| 200 |
305 |
|
|
39 |
82 |
| 300 |
200 |
|
21 |
51 |
71 |
| 400 |
180 |
500 |
23 |
64 |
60 |
| 500 |
150 |
355 |
24 |
70 |
43 |
| 600 |
81 |
190 |
35 |
83 |
74 |
| A sample with a diameter of 10 and a length of 100 mm laminated. Speed deformation of 120 mm/min and strain Rate of 0.02 1/s. |
| 700 |
|
165 |
33 |
94 |
|
| 800 |
|
105 |
62 |
95 |
|
| 900 |
|
75 |
50 |
93 |
|
| A sample with a diameter of 10 and a length of 50 mm laminated. Speed deformation of 120 mm/min and strain Rate of 0.04 1/s. |
| 1000 |
|
55 |
92 |
100 |
|
| 1100 |
|
37 |
100 |
100 |
|
| 1200 |
|
27 |
106 |
100 |
|
Mechanical properties of rolled
| Heat treatment, delivery condition |
Cross-section, mm |
σ0,2, MPa |
σB, MPa |
δ5, % |
| Hot-rolled steel |
<20 |
315 |
590 |
15 |
| Hot-rolled steel |
20−40 |
305 |
590 |
14 |
| Hot-rolled steel |
>40 |
295 |
590 |
12 |
| Hot-deformed pipes of the heat-treated |
|
305 |
590 |
14 |
Mechanical properties of forgings
| Cross-section, mm |
σ0,2, MPa |
σB, MPa |
δ5, % |
ψ, % |
KCU, j/m2 |
HB |
| The Annealing, 830−860°C |
| <400 |
|
670 |
19 |
36 |
|
|
| Isothermal annealing, 830−860°C, isothermal exposure at 630−660°C |
| <400 |
|
640 |
22 |
42 |
|
|
| Normalization 840−880, air cooling to 450−500°C. the High holidays 620−650°C. |
| <300 |
|
640 |
23 |
42 |
|
197 |
| Quenching 840−860°C, oil. Vacation 580−620°C. |
| <220 |
390−530 |
700−850 |
17−24 |
46−54 |
34−54 |
|
| Quenching 840−860°C, water. Vacation 600−640°C. |
| <220 |
390−530 |
670−810 |
18−23 |
50−57 |
39−64 |
|
Technological properties of steel ВСт6сп
| The temperature of forging |
| Beginning about 1250, the end 780. Cross-section up to 400 mm are cooled in air. |
| Weldability |
| Limited weldability; welding methods: SMAW, ADS submerged arc and gas protection electroslag welding. Recommended heating and subsequent heat treatment. The CCC without restriction. |
| Machinability |
| In hot-rolled condition at σB = 640МПа and HB 158 Kυ TV.SPL. = 1,2, Kυ b.St. = 1,2. |
| The tendency to the selling ability |
| Tend not. |
| Placeofpublication |
| Not sensitive. |
Temperature of critical points of steel ВСт6сп
| Critical point |
°C |
| Ac1 |
725 |
| Ac3 |
790 |
| Ar3 |
780 |
| Ar1 |
690 |
Toughness of steel ВСт6сп
Impact strength, KCU, j/cm2
| Delivery condition, heat treatment |
+20 |
-30 |
-60 |
| After rolling |
63 |
46 |
12 |
Endurance limit of steel ВСт6сп
The physical properties of steel ВСт6сп
| Test temperature,°C |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| The normal elasticity modulus, E, GPA |
197 |
197 |
186 |
175 |
168 |
|
|
|
|
|
| Modulus of elasticity shear torsion G, GPA |
82 |
80 |
77 |
74 |
71 |
67 |
62 |
|
|
|
