ASTM A193 GR.B7 B16 B7M cold drawn steel bar QT steel bar
1.ASTM A193 GR.B7 QT cold drawn steel bar
QT steel bar Used in the manufacture of shafts, connecting rods, gears and bolts
Harden ability is better, High overall mechanical properties, good low temperature impact toughness, low notch sensitivity, with temper brittleness
2.Process for Steel round bar
Blast Furnance→ Molten Iron Pretreatment→Converter→LF→VD/RH→ContinuousCasting→Hot Rolling(KOCKS)→ Heat Treatment→ UT Inspection→Finish Product
EAF→LF→VD/RH→ Continuous Casting→Hot Rolling(KOCKS)→ Heat Treatment→ UT Inspection→ Finish Product.
3..ASTM A193 Gr.B7 Cold drawn steel bar Typical applications
Fastners,high strength bolts&nuts,thread rods
4.ASTM A193 Gr.B7 cold drawn steel bar main type and avaliable sizes
| Round bars |
5mm-130mm |
| Suqare bar |
6*6mm-100*100mm |
| Flat bars |
3mm*20mm-50mm*100mm |
| Hex bars |
6mm-100mm |
| Bar Finsihe |
Peeled, Cold Drawn, TurnedTurned & Polished, Centreless Ground |
5.ASTM A193 Gr.B7 Cold drawn steel bar size tolerance
h9,h10,h11 or other tolerance according to client's requirement
6.ASTM A193 Gr.B7 Cold drawn steel bar chemical composition(%)
| Grade |
C |
Cr |
Si |
S |
Mn |
P |
Mo |
| ASTM A193 Gr.B7 |
0.37 - 0.49 |
0.80 - 1.10 |
0.15 - 0.35 |
0.04 max |
0.65 - 1.10 |
0.035 |
0.15 - 0.25 |
7.ASTM A193 Gr.B7 Alternative grade in different standard
| GB |
42CrMo |
| ASTM |
4140 |
| JIS |
SCM440 |
| DIN |
1.7225 |
8.ASTM A193 Gr.B7 Typical Mechanical Properties
| Grade |
Tensile Strength
Mpa |
Yield Strength
Mpa |
Elongation
% |
Reduction
% |
-40ºCAkv2/J |
Hardness |
| 10.9 |
≥1040 |
≥940 |
≥9 |
≥48 |
≥50 |
HRC32-39 |
| 8.8 |
≥830 |
≥660 |
≥12 |
≥52 |
≥70 |
HRC23-34 |
9.Straightness: 1mm/m(max)
10. Steel bar Packing:
*Bars from different heats will not be mixed and dispatched.
*Bars will be bundles and securely metal strapped in 3 min places of the bar length and tagged properly.
*For further processing products such as cold drawn/peeled or heat treated goods, plastics bag wrapped or pallet loading is available according to customer's demands.
Audited Supplier 
){kind=link}
){kind=link}