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Polished Surface 4340 Alloy Steel Round Bar with High Tensile Strength for Mold

China Polished Surface 4340 Alloy Steel Round Bar with High Tensile Strength for Mold

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Polished Surface 4340 Alloy Steel Round Bar with High Tensile Strength for Mold

MOQ： 1 Ton
Price： US $740-1,350 / Ton
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Model NO.	4340
Surface Treatment	Polished
Diameter Range	6-630mm
Round Bar Diameter	16-600mm
Plate Thickness	16-200mm
Plate Width	200-800mm
Length	3000-6000mm
Carbon Content	0.37-0.44%
Silicon Content	0.17-0.37%
Manganese Content	0.50-0.80%
Phosphorus Content	≤0.025%
Sulfur Content	≤0.025%
Chromium Content	0.60-0.90%
Nickel Content	1.25-1.65%
Molybdenum Content	0.15-0.25%

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Product Details
Company Details

Product Specification


Model NO.	4340	Surface Treatment	Polished
Diameter Range	6-630mm	Round Bar Diameter	16-600mm
Plate Thickness	16-200mm	Plate Width	200-800mm
Length	3000-6000mm	Carbon Content	0.37-0.44%
Silicon Content	0.17-0.37%	Manganese Content	0.50-0.80%
Phosphorus Content	≤0.025%	Sulfur Content	≤0.025%
Chromium Content	0.60-0.90%	Nickel Content	1.25-1.65%
Molybdenum Content	0.15-0.25%
High Light	Polished Surface 4340 Alloy Steel Round Bar ，High Tensile Strength 40CrNiMoA Steel Bar ，Mold Steel Application 34CrNiMo6 Alloy Steel Rod

Forged Stainless Steel Round Bar Grade 4340 Alloy Steel Bar

High-quality 1.6582 4340 40CrNiMoA 34CrNiMo6 alloy steel rods designed for demanding industrial applications requiring superior strength and durability.

International Grade Equivalents

GB	AISI	DIN	JIS	EN	TOCT	ISO
40CrNiMoA	4340	1.6582	SNCM439	41NiCrMo 7-3-2	40XH2MA (40XHMA)	36CrNiMo4

Product Specifications

Type	Diameter/Thickness (mm)	Width (mm)	Length (mm)
Round Bar	16-600	/	3000-6000
Plate	16-200	200-800	3000-6000

Custom specifications available upon request.

Chemical Composition

Element	40CrNiMo	4340
C	0.37-0.44%	0.38-0.43%
Si	0.17-0.37%	0.15-0.35%
Mn	0.50-0.80%	0.60-0.80%
P	≤0.025%	≤0.035%
S	≤0.025%	≤0.040%
Cr	0.60-0.90%	0.70-0.90%
Ni	1.25-1.65%	1.65-2.00%
Mo	0.15-0.25%	0.20-0.30%

Key Features

Chromium molybdenum alloy steel construction
High strength and exceptional toughness
Excellent hardenability stability and anti-overheating properties
Superior high tensile strength with outstanding shock resistance

Typical Applications

Heavy machinery and high-load shafts
Rotor shafts and turbine blades
Critical components requiring nitriding treatment for special performance requirements

Packaging Details

20ft Container: Gross Weight 27T (5.80m × 2.13m × 2.18m)
40ft Container: Gross Weight 27T (11.8m × 2.13m × 2.18m)

Delivery Timeline

Standard Products: 15-20 days (abundant stock available)
Customized Products: 30-50 days
Full equipment capability including sawing, grinding, and polishing machines for custom specifications.

Additional Steel Products

Standard/Grade	Flat Bar Size (mm)	Round Bar Size (mm)	Manufacturing Process
1.121 / SAE1050 / S50C / 50#	10-450 × 155-2200 × 2000-12000		Forged, Hot Rolled
1.2311 / P20 / PDS-3 / 3Cr2Mo	10-460 × 155-2200 × 2000-10000	20-200 × 2000-6000
1.2738 / P20+Ni / - / 3Cr2NiMnMo	21-300 × 155-2200 × 2000-8000	20-200 × 2000-6000
1.2379 / D2 / SKD10 / SKD10	10-200 × 155-810 × 2000-6000	14-80 × 3000-6000
1.2080 / D3 / SKD1 / 3Cr2Mo	10-200 × 155-810 × 2000-6000	20-200 × 3000-6000
1.2083 / 420 / - / 4Cr13	10-500 × 155-1200 × 2000-6000	12-300 × 3000-6000
1.2344 / H13 / SKD61 / 4Cr5MoSiV1	10-500 × 155-1600 × 2000-6000	16-400 × 3000-6000
1.2510 / O1 / SKS3 / 9CrWMn	10-200 × 155-810 × 2000-6000	20-200 × 3000-6000
1.7225 / SAE4140 / SCM440 / 42CrMo	10-280 × 155-2200 × 2000-6000	16-450 × 3000-6000

About Our Company

Changfeng Tool & Die Steel is a professional special steel company specializing in this industry in China since 2005. Our comprehensive product range includes:

Plastic Mould Steel
Hot Work Mould Steel
Cold Work Mould Steel
Alloy Structural Steel
Tool Steel
Stainless Steel
Carbon Steel
Forged Block

To ensure the highest quality standards, we maintain close partnerships with China's premier special steel manufacturers including Baosteel Group, Dongbei Special Steel, Changcheng Special Steel, Hongsheng Heavy Industry, Xingcheng Special Steel, and Daye Special Steel.

Company Details

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Business Type:

Manufacturer,Distributor/Wholesaler,Exporter 
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Total Annual:

>1000000
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Employee Number:

>100 
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Ecer Certification：

Verified Supplier 

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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JIANGSU MITTEL STEEL INDUSTRIAL LIMITED
No.283-1, Youyi Middle Road, Xishan District, Wuxi City, Jiangsu Province
https://www.stainless-strips.com/

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