Astma193 Gr. B7 5140 40cr Cold Drawn Steel Qt Round Bar

• Type: Alloy Steel Bar
• Standard: AISI, ASTM, DIN, JIS
• Composition: Ferrous Steel Scrap
• Technique: Cold Drawn
• Shape: Bar
• Surface Treatment: Polished
• Model NO.: steel bar
• Special Use: Cold Heading Steel, High Tensile Bolts
• Application: Structural Steel Bar
• Raw Mateiral: Alloy Steel Bar
• Main Grade: ASTM A193 Gr.B7 B16 B7m 4140 42CrMo
• Supply Condition: Cold Drawn Steel Bar
• Heatr Treatment: Qt Heat Treatment
• Bolts Material: High Tensile Bolts
• Transport Package: Seaworhty Packaging
• Specification: 10-300mm
• Trademark: dajin
• Origin: China
• HS Code: 72283090
• Production Capacity: 5000

Product Description

ASTM A193 GR.B7 B16 B7M 5140 SCR40 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

 

1. 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.

11.Delivery time of steel bar:
7-10days of stock,30 days after order confirmed of new material

12.Payment term:TT or LC

13.Free sample:Yes

14.steel bar Inspection: Spectral Tested, Microstructure Tested,Hardness Test,Macrostructure Test,UT test


15.Our cold drawn factory equipments
We adopt advanced production technology and first-class processing equipments, such as heat treatment furnace, straightening machine, centerless grinding machine, polishing machine, as well as lathing and milling machine etc.


15.Our steel bar mill's certificates

ISO901&ISO.TS16949,ISO4001,OHSAS18001