Scm440 / AISI 4140/ DIN 1.7225 / En19 Hot Rolled Forged Qt Alloy Steel Round Bar

• Type: Alloy Steel Bar
• Standard: AISI, ASTM, GB, JIS, DIN, BS
• Technique: Hot Rolled
• Application: Structural Steel Bar, Tool Steel Bar, Die Steel Bar
• Surface Treatment: Hot Rolled,Steel Self Black
• Alloy: Alloy
• Model NO.: En19 Alloy Steel Round Bar
• Special Use: Mold Steel, Free Cutting Steel, Cold Heading Steel
• Grade: Scm 440 / 42CrMo4/AISI 4140 / En19
• Products: Hot Rolled Steel Round Bar
• Heat Treatment: Q&T
• Inspection: Ut C/C
• Transport Package: Standard Sea Worthy
• Specification: M16-M310
• Trademark: Laiwu Xincheng
• Origin: China
• HS Code: 72283090
• Production Capacity: 3000tons/Month

Product Description

Scm440 / AISI 4140/ DIN 1.7225 / En19 Hot Rolled QT Alloy Steel Round Bar

ISI 4140 alloy steel is chromium, molybdenum, manganese containing low alloy steel. It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength. 

4140 alloy steel material is a high quality Quenched and Tempered Alloy Structural steel, It belong to the high quality medium carbon alloy steel, Oil Quenched & Tempered Hardenss is 28-34 HRC.4140 Annealing delivery hardenss less than 250HB

We always keep 4140 hot rolled steel round bar stocks from diameter 16mm to 310mm with length 6m and 6m to 10m, We can also supplied with fixed cutting short length, if you have need for them, please contact me freely. 

 

Delivery condition Choice:
Hot Rolled
Cold Drawn
Forged
Q&T (Quenched and Tempered)
Annealed/Normalized

Supplied full sizes range for 4140 steel products
Hot Rolled 4140 steel bar: Ø16mm-310mm
Forged 4140 steel bar: Ø200mm-1200mm
Cold drawn 4140 steel bar:Ø12-100mm
Q&T 4140 steel bar:Ø16-310mm
 

1.Equivalent grades in different standard

GB,YB	JIS	DIN(W-Nr.)		BS	NF
42CrMo	SCM440/(SCM4)	42CrMo4-1.7225	4140	708M40/709M40/708A42/EN19	42CD4

2.Chemical composition

Standard	Grade	C	Si	Mn	P	S	Cr	Mo
ASTM A29	4140	0.38-0.43	0.15-0.35	0.75-1.00	≤ 0.035	≤ 0.04	0.8-1.1	0.15-0.25
	42CrMo4	0.38-0.45	≤ 0.4	0.6-0.90	≤ 0.025	≤ 0.035	0.9-1.2	0.15-0.30
EN10083	1.7225
JIS G4105	SCM440	0.38-0.43	0.15-0.35	0.6-0.85	≤ 0.035	≤ 0.04	0.9-1.2	0.15-0.30
GB 3077	42CrMo	0.38-0.45	0.17-0.37	0.5-0.80	≤ 0.035	≤ 0.035	0.9-1.2	0.15-0.25
BS 970	EN19	0.35-0.45	0.15-0.35	0.5-0.80	≤ 0.035	≤ 0.035	0.9-1.5	0.2-0.40

3.Physical property

Tensile Strength	Yield Strength	Elongation	Reduction	Impacting Energy	HBW(after annealing)
Rm,MPa	Rel,MPa	A,%	Z,%	Aku,J	≤
≥1080	≥930	≥12	≥45	≥63	217

 

4.Quality control
1.Processing Line:
Iron - hot metal pretreatment - Converter - Refining --VD / RH- - Continuous Casting - Hot Rolling (KOCKS) - heat --UT Check - Processing and Distribution Center
Electric Furnace - Refining --VD / RH- - Continuous Casting - Hot Rolling (KOCKS) - heat --UT Check - Processing and Distribution Center
2.Gas content level:O2 - <20 ppm H2 - <2 ppm N2- <100 ppm
3.Grain Sizes:5-8
4. non-metallic inclusions contorlling level

	A	B	C	D
	MAX	MAX	MAX	MAX
Thin	2	2	2	2
Thick	1	1	1	1

5.Applications
 4140 steel is a alloy structural steel, 4140 is used for engineering structural, like high tensile shafts, bolts and nuts, gears, pinions and spindles. Locomotive traction with the big gear, supercharger drive gear, pressure vessel, rear axle, gear load of connecting rod and a spring clip,4140 can also be used to under 2000 m deep well of oil drill pipe joint and the fishing tool, and can be used for bending machine mould, etc