5Cr3Mn1SiMo1V is a grade under the Chinese GB standard, representing a high-toughness, impact-resistant tool steel. Its equivalent steels include AISI/ASTM S7 in the United States and DIN W-Nr. 1.2355 in Germany.

1. Chemical Composition(GB/ 1299-2000)

C	Si	Mn	Cr	Ay	V	P	S
0.45-0.55%	0.20-1.00%	0.20-0.90%	3.00-3.50%	1.30-1.80%	≤0.35%	≤0.030%	≤0.030%

2. 5Cr3Mn1SiMo1V Steel Forging Process Specification

Öğe	Isıtma Sıcaklığı (°C)	Initial Forging Temp (°C)	Final Forging Temp (°C)	Soğutma Yöntemi
Çelik Külçe	1120 – 1150	1150 – 1200	900	Yavaş Soğutma
Çelik Kütük	1150 – 1200	1000 – 1150	850	Yavaş Soğutma

3. 5Cr3Mn1SiMo1V Steel Heat Treatment Process Specification

3.1 Ön ısıtma

Ön Isıl İşlem Planı	İşlem Parametreleri
Dövme Sonrası İzotermal Tavlama	Heating Temp: 800-820°C, Soak: 2-3h, Isothermal Temp: 700-720°C, Soak: 3-5h, furnace cool to 550°C then air cool, Hardness after annealing ≤229 HBW
Dövme Sonrası Genel Tavlama	Heating Temp: 800-820°C, Soak: 2-3h, furnace cool to 550°C then air cool, Hardness after annealing ≤229 HRC

3.2 Quenching and Tempering

Söndürme Spesifikasyonu			Tavlama Spesifikasyonu
Quenching Temp (°C)	Soğutma Yöntemi	Sertlik HRC	Temperleme Sıcaklığı (°C)	Sertlik HRC
940 – 955	Hava veya Yağ Soğutma	56	160 – 180	56 – 58

4. Mechanical Properties of 5Cr3Mn1SiMo1V

5Cr3Mn1SiMo1V steel is a high-impact-resistant tool steel. Its elevated chromium content enhances hardenability. Silicon and manganese improve strength and resistance to tempering. Molybdenum and vanadium refine the grain structure, further increasing hardenability and elevating the steel’s overall performance. Additionally, with a chromium content exceeding 2.5% by mass, this steel exhibits excellent resistance to hydrogen embrittlement and oxidation at moderate temperatures.

5. Uygulamalar

5Cr3Mn1SiMo1V steel exhibits high toughness and moderate oxidation resistance at elevated temperatures, making it suitable for manufacturing tools and dies that operate under high impact loads. It is also well-suited for producing hammer forging dies and similar applications.