ASTM 1-194 | Grades | 2H | 2HM | 3 | 4 | 6 | 6F | 7 | 8 | 8T | 8M | 8F | 8C |
EQUIVALENCES | AISI | 1040/50 | 1040/50 | 501 | - | 410 | 416 | 4140/45 | 304 | 321 | 316 | 303 | 347 |
DIN | C45 | C45 | 12 CrMo 19.5 | - | X10Cr13 | - | 42CrMo4 | X5 CrNi 18.09 | X10 CrNi 18.09 | X5 CrNiMo 18.09 | X12 CrNiS 18.09 | X5 CrNiNb 18.09 | |
CHEMICAL REQUERIMENTS | C | >0,40 | >0,40 | >0,10 | 0,4-0,5 | >0,15 | >0,15 | 0,37-0,49 | >0,08 | >0,08 | >0,08 | >0,15 | >0,08 |
Mn | <1 | <1 | <1 | 0,7-0,9 | <1 | <1,25 | 0,65-1,1 | <2 | <2 | <2 | <2 | <2 | |
P (máx.) | 0,04 | 0,04 | 0,04 | 0,04 | 0,04 | 0,06 | 0,04 | 0,045 | 0,045 | 0,045 | 0,2 | 0,045 | |
S (máx.) | 0,05 | 0,05 | 0,03 | 0,04 | 0,03 | 0,06 | 0,04 | 0,03 | 0,03 | 0,03 | 0,15-0,35 | 0,03 | |
Si | <0,40 | <0,40 | <1 | 0,15-0,35 | <1 | <1 | 0,13-35 | <1 | <1 | <1 | <1 | <1 | |
Ni | 8-10,5 | 9-12 | 10-14 | 8-10 | 9-13 | ||||||||
Cr | 4-6 | 11,5-13,5 | 12-14 | 0,75-1,2 | 18-20 | 17-19 | 16-18 | 17-19 | 17-19 | ||||
Mo | 0,4-0,65 | 0,2-0,3 | 0,15-0,25 | 2-3 | |||||||||
Ti | 5 x C | ||||||||||||
Se | >0,15 | ||||||||||||
Nb + Ta | 10 x C | ||||||||||||
MECHANICAL REQUERIMENTS | Hardness | 248 | 352 | 248 | 248 | 228 | 228 | 248 | 126 | 126 | 126 | 126 | 126 |
Brinell | 352 | 237 | 352 | 352 | 271 | 271 | 352 | 300 | 300 | 300 | 300 | 300 | |
Impact test according to A-320 L7 |
J | 27 | 27 | ||||||||||
In low-temperature services and when customer specifies it, it must be done impact tests for grades 4 and 7 (Supplementary requirements of ASTM A-194). Although the Standard’s requirement for Grade 4 is 27 J, the chemical composition of this material do not allows to guarantee that value, therefore when a minimum of 27 J is required, we recommend using Gr.7 nuts. |