MECHANICAL REQUIREMENTS—TABLE 1
| ASTM A193 ASTM A320 |
MINIMUM TEMPERING TEMP. °F (°C) |
TENSILE STRENGTH MIN. KSI (MPA) |
YIELD STRENGTH MIN. KSI. (MPA) |
ELONGATION 2" (50mm) MIN. % |
REDUCTION OF AREA MIN. % |
HARDNESS MAXIMUM |
|
|---|---|---|---|---|---|---|---|
| GRADE | SIZE | ||||||
| B7 | 2-1/2” and under | 1100 (593) | 125 (860) | 105 (725) | 16 | 50 | 321 HB (35HRC) |
| over 2-1/2” to 4” | 1100 (593) | 115 (790) | 95 (655) | 16 | 50 | 321 HB (35HRC) |
|
| B7M Note 1 |
2-1/2” and under | 1150 (620) | 100 (690) | 80 (550) | 18 | 50 | 235 HB (99HRB) |
| over 2-1/2” to 4” | 1150 (620) | 100 (690) | 80 (550) | 18 | 50 | 235 HB (99HRB) |
|
MECHANICAL REQUIREMENTS—TABLE 2
| ASTM A193 ASTM A320 |
MINIMUM TEMPERING TEMP. °F (°C) |
TENSILE STRENGTH MIN.KS1 (MPA) |
YIELD STRENGTH MIN. KSI (MPA) |
ELONGATION 2" (50mm) MIN. % |
REDUCTION OF AREA MIN. % |
HARDNESS MAXIMUM |
|
|---|---|---|---|---|---|---|---|
| GRADE | SIZE | ||||||
| L7 | 2-1/2” and under | Quenched and Tempered 1100 (593) |
125 (860) | 105 (725) | 16 | 50 | |
| L7M Note 4 |
2-1/2” and under | Quenched and Tempered 1150 (620) |
100 (690) | 80 (550) | 18 | 50 | 235 HB (99HRB) |
MECHANICAL REQUIREMENTS—TABLE 3
| ASTM A193 ASTM A320 |
MINIMUM TEMPERING TEMP. °F (°C) |
TENSILE STRENGTH MIN. KSI (MPA) |
YIELD STRENGTH MIN. KSI. (MPA) |
ELONGATION 2" (50mm) MIN. % |
REDUCTION OF AREA MIN. % |
HARDNESS MAXIMUM |
|
|---|---|---|---|---|---|---|---|
| GRADE | SIZE | ||||||
| B8 Class 1 Note 2, 3 |
All Diameters |
Carbide Solution Treated |
75 (515) | 30 (205) | 30 | 50 | 223 HB (96HRB) |
| B8 Class 2 Note 2 |
3/4” and under | Carbide Solution Treated and Strain Hardened | 125 (860) | 100 (690) | 12 | 35 | 321 HB (35HRC) |
| over 3/4” to 1” |
115 (790) | 80 (550) | 15 | 35 | |||
|
over 1” to 1-1/4” |
105 (725) | 65 (450) | 20 | 35 | |||
| over 1-1/4” to 1-1/2" |
100 (690) | 50 (345) | 28 | 35 | |||
MECHANICAL REQUIREMENTS—TABLE 4
| ASTM A193 ASTM A320 |
MINIMUM TEMPERING TEMP. °F (°C) |
TENSILE STRENGTH MIN. KSI (MPA) |
YIELD STRENGTH MIN. KSI. (MPA) |
ELONGATION 2" (50mm) MIN. % |
REDUCTION OF AREA MIN. % |
HARDNESS MAXIMUM |
|
|---|---|---|---|---|---|---|---|
| GRADE | SIZE | ||||||
| B8M Class 1 Note 2, 3 |
All Diameters |
Carbide Solution Treated |
75 (515) | 30 (205) | 30 | 50 | 223 HB (96HRB) |
| B8M Class 2 Note 2 |
3/4” and under | Carbide Solution Treated and Strain Hardened | 110 (760) | 95 (655) | 15 | 45 | 321 HB (35HRC) |
| over 3/4” to 1” |
100 (690) | 80 (550) | 20 | 45 | |||
|
over 1” to 1-1/4” |
95 (655) | 65 (450) | 25 | 45 | |||
| over 1-1/4” to 1-1/2" |
90 (620) | 50 (345) | 30 | 45 | |||
MECHANICAL REQUIREMENTS—TABLE 5
Impact Energy Absorption Requirements
Bolting for Low-Temperature Service
| ASTM A320 | A320M | MINIMUM AVERAGE IMPACT VALUE FOR EACH SET OF 3 SAMPLES 10 x 10 x 50mm K. - lbs. (Joules) |
|
|---|---|---|
| GRADE | TEST TEMP. °F (°C) |
|
| L7 | -150 (-101) | 20 (27) |
| L7M | -100 (-73) | 20 (27) |
| L43 | -150 (-101) | 20 (27) |