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Microalloyed Medium Carbon Steel

Overview

Microalloyed medium carbon steel, also known as non-quenched and tempered mechanical structural steel , is an advanced type of steel that achieves high strength and toughness without the need for traditional quenching and tempering processes. Through microalloying, controlled rolling (or forging), and controlled cooling, this steel type offers mechanical properties comparable to quenched and tempered steels, making it a superior choice for various engineering applications.

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Characteristics

High Strength and Toughness:Achieves exceptional mechanical properties through microalloying and controlled processing, eliminating the need for additional heat treatment.
Improved Weldability:Enhanced weldability compared to quenched and tempered steels due to lower carbon content and optimized alloying elements.
Cost Efficiency:Reduces manufacturing costs by eliminating the quenching and tempering processes, saving time and energy.
Environmental Benefits:Lower energy consumption and reduced CO2 emissions due to the absence of heat treatment.

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Production Process

Microalloying:Incorporates small amounts of alloying elements such as vanadium, niobium, and titanium to enhance strength and toughness.
Controlled Rolling/Forging:Precisely controlled rolling or forging processes refine the grain structure, improving the steel’s mechanical properties.
Controlled Cooling:Implementing specific cooling rates and methods to achieve desired properties, eliminating the need for quenching and tempering.

Applications

Automotive Industry:Used in manufacturing critical components like crankshafts, connecting rods, and suspension systems, where high strength and toughness are required.
Construction Machinery:Ideal for making heavy-duty parts such as excavator arms, bulldozer blades, and crane booms, offering durability and resistance to wear.
Railway Engineering:Applied in the production of railway track components, couplings, and other high-stress parts, ensuring long-term performance and reliability.
Agricultural Equipment:Utilized in producing durable and high-strength parts for tractors, harvesters, and other farming machinery, enhancing their operational lifespan.

Common Sizes

Sheet and Plate:

Thickness: 0.5mm – 200mm

Width: 600mm – 2500mm

Length: 2000mm – 12000mm

Bar:

Diameter: φ16-190mm

Length 4-12m

Chemical Composition

Microalloyed Medium Carbon Steel
NO.	Grade	Chemical Composition (Mass Fraction) /%
NO.	Grade	C	Si	Mn	S	P	V	Cr	Ni	Cu^b	其他
1	F35VS	0.32~ 0.39	0.20~ 0.40	0.60~ 1.00	0.035~ 0.075	≤ 0.035	0.06~ 0.13	≤ 0.30	≤ 0.30	≤ 0.30
2	F40VS	0.37~ 0.44	0.20~ 0.40	0.60~ 1.00	0.035~ 0.075	≤ 0.035	0.06~ 0.13	≤ 0.30	≤0.30	≤ 0.30
3	F45VS^a	0.42~ 0.49	0.20~ 0.40	0.60~ 1.00	0.035~ 0.075	≤ 0.035	0.06~ 0.13	≤ 0.30	≤ 0.30	≤ 0.30
4	F30MnVS	0.26 0.33	≤0.80	1.20~ 1.60	0.035~ 0.075	≤ 0.035	0.08~ 0.15	≤ 0.30	≤ 0.30	≤ 0.30
5	F35MnVS^a	0.32~ 0.39	0.30~ 0.60	1.00~ 1.50	0.035~ 0.075	≤ 0.035	0.06~ 0.13	≤ 0.30	≤ 0.30	≤ 0.30
6	F38MnVS	0.34~ 0.41	≤0.80	1.20~ 1.60	0.035~ 0.075	≤ 0.035	0.08~ 0.15	≤ 0.30	≤ 0.30	≤ 0.30
7	F40MnVS^a	0.37~- 0.44	0.30~ 0.60	1.00~ 1.50	0.035~- 0.075	≤ 0.035	0.06~ 0.13	≤ 0.30	≤ 0.30	≤ 0.30
8	F45MnVS	0.42~ 0.49	0.30~ 0.60	1.00~ 1.50	0.035~ 0.075	≤ 0.035	0.06~ 0.13	≤ 0.30	≤ 0.30	≤ 0.30
9	F49MnVS	0.44~ 0.52	0.15~ 0.60	0.70~ 1.00	0.035~ 0.075	C	0.08~ 0.15	≤ 0.30	≤ 0.30	≤ 0.30
10	F12Mn2VBS	0.09~0.16	0.09~0.16	2.20~2.65	0.035~0.075	≤ 0.035	0.06~0.12	≤ 0.30	≤ 0.30	≤ 0.30	B 0.001~0.004

Comparison Table of Steel Grades by Country

Microalloyed Medium Carbon Steel
NO.	GB	ISO 11692
1	F35VS	—
2	F40VS	—
3	F45VS	—
4	F30MnVS	30MnVS6
5	F35MnVS	—
6	F38MnVS	38MnVS6
7	F40MnVS	—
8	F45MnVS	—
9	F49MnVS	49MnVS3
10	F12Mn2VBS	—

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