Steel 20ps
Description
Steel 20ps
Steel 20ps: brand of steels and alloys. Below is the systematized information on the purpose, chemical composition, types of supplies, substitutes, temperature of critical points, physical, mechanical, technological and casting properties for the grade — Steel 20ps.
General information of steel 20ps
| Substitute brand |
| steel 15kp |
| Delivery type |
| Long products, including shaped: GOST 2590−71, GOST 2879−69, GOST 19772−74, GOST 19771−74, GOST 8278−75, GOST 8281−80, GOST 8282−83, GOST 8283−77, GOST 10702 -78. Calibrated bar GOST 7417−75, GOST 8560−78, GOST 10702−78. Polished bar and silver bar GOST 14955−77, GOST 10702−78. Thick sheet GOST 19903−74, GOST 4041−71, GOST 1577−81. Thin sheet GOST 19903−74, GOST 16523−70, GOST 19904−74. Tape GOST 10234−77. Strip GOST 82−70, GOST 103−76, GOST 1577−81. Wire GOST 17305−71, GOST 2771−81, GOST 3282−74, GOST 5663−79. Pipes GOST 10705−80, GOST 10704−91. |
| Application |
| Without heat treatment or after normalization — pipes, fittings, plugs, bolts, flanges, apparatus bodies and other parts made of boiling steel, operating from -20 to 425 ° C; after carburizing and cyanidation — parts that require high surface hardness and low core strength (axles, fasteners, pins, sprockets, etc.). |
Chemical composition of steel 20ps
| Chemical element |
% |
| Silicon (Si) |
0.05−0.17 |
| Manganese (Mn) |
0.35−0.65 |
| Copper (Cu), no more |
0.25 |
| Arsenic (As), no more |
0.08 |
| Nickel (Ni), no more |
0.25 |
| Sulfur (S), no more |
0.04 |
| Carbon (C) |
0.17−0.24 |
| Phosphorus (P), no more |
0.035 |
| Chromium (Cr), no more |
0.25 |
Mechanical properties of steel 20ps
| Heat treatment, delivery condition |
σ B, MPa |
δ 5 ,% |
ψ,% |
HB |
| Calibrated and calibrated steel with special finishing after annealing or tempering |
390−490 |
|
50 |
163 |
| Calibrated and calibrated steel with special finishing after spheroidizing annealing |
345−440 |
|
50 |
163 |
| Steel calibrated and calibrated with a special finish, work-hardened without heat treatment |
490 |
7 |
45 |
197 |
| Normalized or hot rolled strips |
380 |
27 |
55 |
|
| Heat-treated sheets of the 1st-2nd category |
345−490 |
28 |
|
127 |
Mechanical properties of steel after HTT
| Section, mm |
σ 0.2, MPa |
σ B, MPa |
δ 5 ,% |
ψ,% |
KCU, J / m 2 |
HB |
HRC e |
| Cementation 920−950 ° C, quenching 800−820 ° C, water, tempering 180−200 ° C, air. |
| 50 |
295 |
490 |
sixteen |
40 |
49 |
156 |
55−63 |
Technological properties of steel 20ps
| Forging temperature |
| Beginning 1280, end 750. Air cooling. |
| Weldability |
| It can be welded without restrictions (except for HTO parts). Welding methods: RDS, ADS submerged arc and gas shielded, KTS. |
| Machinability by cutting |
| In hot-rolled condition at HB 130 K υ tv.spl. = 1.7 and K υ b.st. = 1.6. |
| Tendency to release ability |
| Not inclined. |
| Flock sensitivity |
| Not sensitive. |
Temperature of critical points of steel 20ps
| Critical point |
° C |
| Ac1 |
735 |
| Ac3 |
850 |
| Ar3 |
835 |
| Ar1 |
680 |
Impact strength of steel 20ps
Impact strength, KCU, J / cm 2
| Delivery status, heat treatment |
+20 |
-20 |
-40 |
-60 |
| Strip 12 mm thick. Quenching, tempering |
257 |
200−223 |
170−304 |
174 |
| Strip 12 mm thick. Normalization, vacation |
225−230 |
131−180 |
127−147 |
9−80 |
| Strip 12 mm thick. Annealing |
132−143 |
41 |
fifteen |
fifteen |
Physical properties of steel 20ps
| Test temperature, ° С |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| Normal elastic modulus, E, GPa |
212 |
208 |
203 |
197 |
189 |
177 |
163 |
140 |
|
|
| Density of steel, pn, kg / m 3 |
|
7834 |
7803 |
7770 |
7736 |
7699 |
7659 |
7617 |
7624 |
7600 |
| Thermal conductivity coefficient W / (m ° С) |
|
51 |
49 |
44 |
43 |
39 |
36 |
32 |
26 |
26 |
| Ud. electrical resistance (p, Nom. m) |
|
219 |
292 |
381 |
487 |
601 |
758 |
925 |
1094 |
1135 |
| Test temperature, ° С |
20−100 |
20−200 |
20−300 |
20−400 |
20−500 |
20−600 |
20−700 |
20−800 |
20−900 |
20−1000 |
| Linear expansion coefficient (a, 10−6 1 / ° С) |
12.3 |
13.1 |
13.8 |
14.3 |
14.8 |
15.1 |
15.2 |
|
|
|
| Specific heat (C, J / (kg ° C)) |
486 |
498 |
514 |
533 |
555 |
584 |
636 |
703 |
703 |
695 |
