ISO 898-1 Carbon Steel and Alloy Steel - Bolts, screws and studs

Bolts, Screws and Studs (Carbon And Alloy Steel)

Chemical composition as per ISO 898-1 for typical grades

Class Material and Treatment C
min.
C
max.
P
max.
S
max.
B
max.
Tempering temp.
[°C]
8.8 carbon steel with additives (e.g. b, mn or cr) quenched and tempered 0.15 (d) 0.40 0.025 0.025 0.003 425
8.8 carbon steel quenched and tempered 0.25 0.55 0.035 0.025 0.003 425
10.9 carbon steel with additives (e.g. b, mn or cr) quenched and tempered 0.15 (d) 0.35 0.025 0.025 0.003 340
10.9 carbon steel quenched and tempered 0.25 0.55 0.025 0.025 0.003 425
10.9 carbon steel with additives (e.g. b, mn or cr) quenched and tempered 0.20 (d) 0.55 0.025 0.025 0.003 425
10.9 alloy steel quenched and tempered (g) 0.20 0.55 0.025 0.025 0.003 425
12.9 alloy steel quenched and tempered (g) 0.28 0.50 0.025 0.025 0.003 380

(d) in case of plain carbon boron steel with a carbon content below 0.25% (ladle analysis), min manganese 0.6% for 8.8 and 0.7% for 10.9
(g) alloy steel shall contain one of the following elements: chromium 0.30%, nickel 0.30%, molybdenum 0.20%, vanadium 0.10%

Mechanical and physical properties as per ISO 898-1 for typical grades

Mechanical or Physical Property Class 8.8
(M16 and below)
Class 8.8
(above M16)
Class 10.9 Class 12.9
Tensile strength
(MPa)
nom. 800 800 1000 1200
Tensile strength
(MPa)
min. 800 830 1040 1220
Stress at 0.2% non-proportional elongation (yield)
(MPa)
nom. 640 640 900 1080
Stress at 0.2% non-proportional elongation (yield)
(MPa)
min. 640 660 940 1100
Stress under proof load
(MPa)
nom. 580 600 830 970
Elongation after fracture for machined test piece
(%)
min. 12 12 10 8
Reduction of area after fracture for machined test piece
(%)
min. 52 52 48 44
Impact strength, charpy v-notch
(J)
min. 27 27 27 (under investigation)

Hardness requirement as per ISO 898-1 for typical grades

Hardness Scale Class 8.8
(M16 and below)
Class 8.8
(above M16)
Class 10.9 Class 12.9
Vickers, HV 250-320 255-335 320-380 385-435
Brinell, HB 238-304 242-318 304-361 366-414
Rockwell, HRC 22-32 23-34 32-39 39-44

Whilst the information is provided in good faith, Andrews Fasteners Ltd are not under any responsibility or liability in respect of errors or information that was found to be incorrect or for any reliance the user may place on it.

↫ Go back