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SAE4340 Steel Round Bar Hot Rolled Annealed 228HB Hardness Free of Scale Surface

China SAE4340 Steel Round Bar Hot Rolled Annealed 228HB Hardness Free of Scale Surface

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SAE4340 Steel Round Bar Hot Rolled Annealed 228HB Hardness Free of Scale Surface

MOQ： 1 Ton
Price： US $1,020-1,380 / T
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Material Grade	SAE4340
Shape	Bar
Surface Treatment	Polished
Width Range	10-2000mm
Carbon Content	0.38~0.43%
Silicon Content	0.15~0.35%
Manganese Content	0.60~0.80%
Chromium Content	0.70~0.90%
Molybdenum Content	0.20~0.30%
Nickel Content	1.65~2.00%
Tensile Strength	≥980 MPa
Elongation	≥12%
Cross-sectional Shrinkage	≥55%
Impact Work	>25 J
Hardness	≤269 HB

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Product Specification


Material Grade	SAE4340	Shape	Bar
Surface Treatment	Polished	Width Range	10-2000mm
Carbon Content	0.38~0.43%	Silicon Content	0.15~0.35%
Manganese Content	0.60~0.80%	Chromium Content	0.70~0.90%
Molybdenum Content	0.20~0.30%	Nickel Content	1.65~2.00%
Tensile Strength	≥980 MPa	Elongation	≥12%
Cross-sectional Shrinkage	≥55%	Impact Work	>25 J
Hardness	≤269 HB
High Light	Hot Rolled Annealed Steel Round Bar ，228HB Hardness Alloy Steel Bar ，Free of Scale Surface SAE4340 Steel Bar

SAE4340 / 1.6511 Rectangular Bar - Hot Rolled Annealed

Material: SAE4340 per ASTM A322 • Condition: Hot Rolled Annealed • Hardness: 228HB • Surface: Free of Scale • Tolerances: ±1mm

Material Overview

SAE4340 (Grade 1.6511) offers exceptional strength, toughness, and hardenability with good resistance to overheating. This alloy steel exhibits high sensitivity to white points and temper brittleness, with welding requiring preheating and post-weld stress relief treatment.

Chemical Composition

Element	Content (%)
C (Carbon)	0.38-0.43
Si (Silicon)	0.15-0.35
Mn (Manganese)	0.60-0.80
S (Sulfur)	≤0.040
P (Phosphorus)	≤0.035
Cr (Chromium)	0.70-0.90
Mo (Molybdenum)	0.20-0.30
Ni (Nickel)	1.65-2.00

Key Features

Excellent hardenability for uniform properties
High toughness and impact resistance
Superior heat and fatigue resistance
Good anti-overheating stability

Applications

Ideal for high-stress components requiring exceptional toughness and strength, including:

High-load axles and turbine shafts
Helicopter rotor shafts (>250mm diameter)
Turbojet engine turbine shafts and blades
Heavy machinery transmission components
Fasteners, crankshafts, and gears
Components operating above 400°C
Nitrided parts for specialized applications

Heat Treatment

Process	Temperature	Cooling	Hardness
Quenching	850°C	Oil	≤269HB
Tempering	600°C	Water/Oil	≤269HB

Mechanical Properties

Tensile Strength (σb): ≥980 MPa (100 kgf/mm²)
Elongation (δ5): ≥12%
Reduction of Area (ψ): ≥55%
Impact Energy (Akv): >25 J
Impact Toughness (αkv): ≥98 J/cm² (10 kgf·m/cm²)

Delivery Information

Condition: Hot rolled or forged, black surface

Stock Products: 15-20 days

Customized Products: 30-50 days

Additional Steel Products

Plastic Mold Steel

DIN	AISI/SAE	JIS	GB	Plate Size (mm)	Round Bar (mm)	Process
1.1210	1050	S50C	50#	10-1000×155-2200×3000-6000	Ø10-350×3000-6000	Hot Rolled
1.1191	1045	S45C	45#	10-700×155-2200×3000-6000	Ø10-300×3000-6000	Hot Rolled
1.2311	P20	PDS-3	3Cr2Mo	12-800×155-2200×2000-6000	Ø20-200×2000-6000	Forged/Hot Rolled
1.2738	P20+Ni	-	3Cr2NiMnMo	21-1000×155-2200×2000-6000	Ø20-200×2000-6000	Forged/Hot Rolled
1.2083	420	-	4Cr13	12-500×155-1200×2000-6000	Ø12-300×3000-6000	Forged/Hot Rolled

Hot & Cold Work Mold Steel

DIN	AISI/SAE	JIS	GB	Plate Size (mm)	Round Bar (mm)	Process
1.2344	H13	SKD61	4Cr5MoSiV1	16-500×155-500×2000-6000	Ø16-200×3000-6000	Forged/Hot Rolled
1.2379	D2	SKD10	SKD10	6-200×155-810×2000-6000	Ø10-180×3000-6000	Forged/Hot Rolled
1.2080	D3	SKD1	3Cr2Mo	10-200×155-810×2000-6000	Ø10-180×3000-6000	Forged/Hot Rolled
1.2510	O1	SKS3	9CrWMn	10-200×155-810×2000-6000	Ø20-200×3000-6000	Forged/Hot Rolled

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Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative... Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative...

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