En24 Steel Properties BS970 817M40 En24T Material Equivalent, Tempering, Strength & Hardness
En24 Steel Properties BS970 817M40 (En24T Material)
The following tables summarize BS970 817M40 (En24T Material), En24 steel properties, and specification including chemical composition, mechanical properties, hardness, heat treatment, etc.
Chemical Composition
EN24 steel (En24T steel) and BS970 817M40 material chemical composition is listed in the following table.
| Chemical Composition (Cast Analyses ), % | ||||||||||
| Country (Region) | Standard | Steel Grade | C | Si | Mn | P, ≤ | S, ≤ | Cr | Ni | Mo |
| Britain | BS 970-1955 | En24 (En24T) | 0.35-0.45 | 0.10-0.35 | 0.45-0.70 | 0.050 | 0.05 | 0.90-1.40 | 1.3-1.8 | 0.20-0.35 |
| BS 970-1991 | 817M40 | 0.36-0.44 | 0.10-0.40 | 0.45-0.70 | 0.035 | 0.04 | 1.00-1.40 | 1.3-1.7 | 0.20-0.35 | |
Mechanical Properties
En24 (En24T) and 817M40 steel mechanical properties are listed in the following tables including yield strength (yield stress), ultimate tensile strength, shear strength, modulus of elasticity, young’s modulus, etc.
Notes:
- 1 MPa = 1 N/mm2
- 1 GPa = 1 kN/mm2
| Reference symbols for tensile strength ranges | |
| Symbol | Tensile Strength, MPa (ksi) |
| P | 550-700 (80-100) |
| Q | 625-775 (90-112) |
| R | 700-850 (100-123) |
| S | 775-925 (110-134) |
| T | 850-1000 (123-145) |
| U | 925-1075 (134-156) |
| V | 1000-1150 (145-167) |
| W | 1075-1225 (156-177) |
| X | 1150-1300 (167-188) |
| Y | 1225-1375 (177-199) |
| Z | ≥ 1550 (225) |
| En24T, En24 Mechanical Properties | ||||||||
| Standard | Steel | Hardened and tempered condition | Limiting ruling section, in (mm) | Tensile strength, tons/in2 (Mpa) [ksi], ≥ | Yield stress, tons/in2 (Mpa) [ksi], ≥ | Elongation, %, ≥ | Izod impact, ft lb, ≥ | Brinell hardness, HB |
| BS970-1955 | En24 | S | 6 (152) | 50 (772) [112] | 38 (587) [85] | 20 | 40 | 223-277 |
| T | 6 (152) | 55 (850) [123] | 44 (680) [98] | 18 | 40 | 248-302 | ||
| U | 4 (101) | 60 (926) [134] | 48 (741) [107] | 17 | 35 | 269-321 | ||
| V | 2.5 (63.5) | 65 (104) [145] | 52 (803) [116] | 16 | 35 | 293-341 | ||
| W | 1.125 (28.5) | 70 (1081) [157] | 58 (895) [130] | 15 | 30 | 311-375 | ||
| X | 1.125 (28.5) | 75 (1158) [168] | 63 (973) [141] | 14 | 25 | 341-388 | ||
| Y | 1.125 (28.5) | 80 (1235) [179] | 68 (1050) [152] | 14 | 22 | 363-415 | ||
| Z | 1.125 (28.5) | 100 (1544) [224] | 85 (1313) [190] | 8 | 8 | ≥ 444 | ||
| BS970 817M40 Steel Mechanical Properties | |||||||||
| Standard | Steel | Tensile strength, Mpa (ksi), ≥ | Yield strength, Mpa (ksi), ≥ | 0,2 % proof strength | Elongation after fracture, 5.65 √S0 , ≥ | Impact, Izod (Charpy V-notch impac) in J, ≥ | Hardness, HB | Diameter across flats or thickness (t), mm | Condition |
| BS 970-1991 | 817M40 | 850-1000 (123-145) | 650 (94) | 635 (92) | 13 | 40 (35) | 248-302 | 150<t≤250 | Normalized + turned or ground |
| 850-1000 (123-145) | 680 (98) | 665 (96) | 13 | 54 (50) | 248-302 | 63<t≤150 | |||
| 925-1075 (134-156) | 750 (109) | 740 (107) | 12 | 47 (42) | 269-331 | 29<t≤100 | |||
| 1000-1150 (145-166) | 850 (123) | 835 (121) | 12 | 47 (42) | 293-352 | 13<t≤63 | |||
| 1075-1225 (156-177) | 940 (136) | 925 (134) | 11 | 40 (35) | 311-375 | 6≤t≤29 | |||
| 1150-1300 (166-188) | 1020 (145) | 1005 (145) | 10 | 34 (28) | 341-401 | 6≤t≤29 | |||
| ≥ 1550 (225) | 1235 (179) | 1125 (163) | 5 | 10 (9) | 444 ≥ | 6≤t≤29 | |||
| 850-1000 (123-145) | 700 (101) | 680 (98) | 9 | 54 (-) | 248-302 | 63<t≤150 | Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground |
||
| 925-1075 (134-156) | 770 (111) | 755 (109) | 9 | 47 (-) | 269-331 | 29<t≤100 | |||
| 1000-1150 (145-166) | 865 (125) | 850 (123) | 9 | 47 (-) | 293-352 | 13<t≤63 | |||
| 1075-1225 (156-177) | 955 (138) | 940 (136) | 8 | 40 (-) | 311-375 | 6≤t≤29 | |||
| 1150-1300 (166-188) | 1035 (150) | 1020 (150) | 7 | 34 (-) | 341-401 | 6≤t≤29 | |||
| ≥ 1550 (225) | 1250 (181) | 1235 (179) | 3 | 11 (-) | ≤ 444 | 6≤t≤29 | |||
| 227 | Turned, ground or cold drawn and finally softened |
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Heat Treatment
En24 material heat treatment are listed below, including normalizing, hardening and termpering.
- Hardening: 830 to 860 °C (1525-1580 °F), oil quench,
- Tempering temperature: 550 to 660 °C (1020-1220 °F)
Applications
EN24 steel is widely used in gears, pinions, shafts, and spindles in the automotive and machine tool industries. Production of parts such as locomotives, cranes, rolling mills, coal cutters, etc. Die casting and hot metal processing, such as mold support, racks and gears, needle angle die casting, Hot stamping of stamping dies, aluminum and steel stamping die beds, low temperature nuts, bolts and rivets. Widely used in plastics, rubber molds, hobs and combination mold buckles, mold stop pins, etc.
En24 Steel Equivalent Grade
BS970 817M40 material or En24T, En24 steel equivalent to European EN (German DIN EN, French NF EN), ISO, Japanese JIS and Chinese GB standard (for reference).
| En24T, En24 and 817M40 Steel Equivalent | |||||||||||
| Britain | European Union | ISO | China | US | Japan | ||||||
| Standard | Steel name | Standard | Steel name (Steel number) | Standard | Grade | Standard | Grade | Standard | Grade (UNS) | Standard | Grade |
| BS970-1955; BS970-1991 |
En24; 817M40 |
EN 10083-3 | 34CrNiMo6 (1.6582) | ISO 683-18 | 34CrNiMo6 | GB/T 3077 | 34Cr2Ni2Mo | ||||
Related material: En8 steel (BS970 080M40), DC01 Steel (1.0330), 1.4034 (X46Cr13), 6061-T6 Aluminium Alloy, 304 vs 316 Stainless Steel
