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4340 H chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of 4340 H

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AS 4340 H

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This page is mainly introduced the 4340 H chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of 4340 H,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
4340 H

Steel Garde:4340 H
Type:Special Alloy
Country:Australia
Standard:AS
Application:Australia Structural steel

Relevant products:

D6AC Forging Hollow Bar

17-4ph steel wire

A387 F5 / Grade 5 Coil / Sheet

GH 3536 Sheet

4145H Hollow Bar

IncoloyA-286 / GH 2132

HastelloyC-22 round bar

GH3039 round bar

HastelloyC-276 round bar

Incoloy800 round bar

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
ICI 4340	AISI	USA
414340	CSN	Czech Republic
14340	CSN	Czech Republic
4340	AS	Australia
4340	AS	Australia
H11	ASTM	USA
H12	ASTM	USA
H14	ASTM	USA
H19	ASTM	USA
H21	ASTM	USA
H22	ASTM	USA
H24	ASTM	USA
H25	ASTM	USA
H26	ASTM	USA
H41	ASTM	USA
H42	ASTM	USA
H43	ASTM	USA
M2 hight C	ASTM	USA
M10 Hight C	ASTM	USA
CH-12	ASTM	USA
CH-13	ASTM	USA
CPM H13	AISI	USA
CPM H19	AISI	USA
CPM H19V	AISI	USA
CPM Rex M2HCHS	AISI	USA
CPM Rex M4HS	AISI	USA
CPM Rex M35HCHS	AISI	USA
CPM Rex 45HS	AISI	USA
CPM Rex T15HS	AISI	USA
CPM Rex 76HS	AISI	USA
HAP 10	AISI	USA
HAP 40	AISI	USA
HAP 50	AISI	USA
HAP 60	AISI	USA
HAP 70	AISI	USA
KHA 33N	AISI	USA
1.2714	DIN	Germany
SKH2	JIS	Japan
SKH3	JIS	Japan
SKH4	JIS	Japan
SKH10	JIS	Japan
SKH40	JIS	Japan
SKH50	JIS	Japan
SKH51	JIS	Japan
SKH52	JIS	Japan
SKH53	JIS	Japan
SKH54	JIS	Japan
SKH55	JIS	Japan
SKH56	JIS	Japan
SKH57	JIS	Japan

Chemical composition(mass fraction)(wt.%)

Mechanical Properties

Tensile strength	621～647	σb/MPa
Yield Strength	169	σ 0.2 ≥/MPa
Elongation	96	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	713～098	-
HRC	30	-

Physical Properties

Thermal expansion	85-86	e-6/K
Thermal conductivity	19-82	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	2748-0645	째C
Density	4077-7254	kg/m³
Resistivity	0.50-0.60	Ohm.mm²/m

Heat Treatment Regime

Annealing	Quenching	Tempering	Normalizing	Q & T
√	√	√	√	√

Size Availability

Steel Grade	Specification	Processing range(mm)
4340 H Special Alloy	Round Bar and Hollow Bar	Φ1 to Φ2000
	Square and Flat Steel	Φ10 to Φ100
	Plate and Sheet	0.08-800(Thickness)10-1500(Width)Length
	Tube or Pipe	OD:Φ4-410; WT:1-35 mm; Lenght:10-12000
	Coil and Strip Steel	THK:0.1mm Width:1500mm
	Forged	Ring/Cylindrical/Disk