ASTM A193 Gr. B7 4140 5140 Cold Drawn Steel Bar Qt Steel Bar

• Type: Round
• Standard: AISI, ASTM, DIN, JIS
• Composition: Ferrous Steel Scrap
• Technique: Cold Drawn
• Shape: Bar
• Surface Treatment: Polished
• Model NO.: alloy steel bar
• Special Use: Cold Heading Steel, Mold Steel
• Application: Auto Parts,Bolts&Nuts,Shaft
• Material: Alloy Steel Bar
• Grade: SAE4140 B7 B16 5140 40cr Scm440 Gr10.9 Gr8.8
• Production Process: Cold Drawn+Qt+Polished
• Surface: Bright or Black Surface
• Threading Procesing: Yes
• Ready Stock: Yes
• Transport Package: Anti-Rust Packaging
• Specification: dia: 5mm-100mm
• Trademark: dajin
• Origin: China
• HS Code: 72284000
• Production Capacity: 2000

Product Description

ASTM A193 GR.B7 4140  5140 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