SNCM431 4340 DIN 1.6580 30CrNiMo8 Hardened Steel

 

 

 

 

 

 

 

 

 

1.6580 Chromium-Nickel-Molybdenum Alloy Steel (30CrNiMo8)

Product Description

FUSHUN METAL’s 1.6580 (30CrNiMo8) is a premium chromium-nickel-molybdenum alloyed tempering steel offering an exceptional combination of high strength, excellent toughness, and superior hardenability. With a carefully engineered chemical composition featuring optimized levels of chromium (1.80-2.20%), nickel (1.80-2.20%), and molybdenum (0.30-0.50%), our 1.6580 delivers outstanding performance in demanding applications requiring superior mechanical properties. This versatile steel is specifically developed for components in automotive engineering and general mechanical engineering with high demands on strength and toughness along with good hardenability, such as fasteners and critical structural parts. Available in round bars, flat bars, plates, and custom shapes, FUSHUN METAL’s 1.6580 steel provides consistent quality and reliable performance for the most demanding engineering applications.

Material Designations and Standards

1.6580 (30CrNiMo8) conforms to the following standards:

Standard	Designation
EN 10083-3	1.6580 / 30CrNiMo8
EN 10269	1.6580 / 30CrNiMo8
DIN 17200	1.6580 / 30CrNiMo8
DIN 1654 Teil 4	1.6580 / 30CrNiMo8
ISO 683-1	31CrNiMo8
BS	823M30
AFNOR	30NCD8

Chemical Composition

FUSHUN METAL’s 1.6580 (30CrNiMo8) Steel features the following chemical composition according to standard specifications:

Element	Content (%)
Carbon (C)	0.26 – 0.34
Silicon (Si)	max. 0.40
Manganese (Mn)	0.30 – 0.60
Chromium (Cr)	1.80 – 2.20
Nickel (Ni)	1.80 – 2.20
Molybdenum (Mo)	0.30 – 0.50
Iron (Fe)	Balance

Key Element Functions

• Carbon (0.26-0.34%): Provides optimum hardness and strength after heat treatment while maintaining good toughness.
• Chromium (1.80-2.20%): Significantly enhances hardenability, improves wear resistance, and contributes to overall strength and corrosion resistance.
• Nickel (1.80-2.20%): Improves toughness, especially at low temperatures, and enhances hardenability.
• Molybdenum (0.30-0.50%): Improves hardenability, prevents temper brittleness, and enhances high-temperature strength and creep resistance.
• Manganese (0.30-0.60%): Increases hardenability and contributes to strength.
• Silicon (max 0.40%): Acts as a deoxidizer during steelmaking and contributes to strength.

Main Applications

The tempering steel 30CrNiMo8 is used for components in automotive engineering and general mechanical engineering with high demands on strength and toughness along with good hardenability:

• High-strength fasteners and connecting elements
• Heavy-duty automotive components
• Transmission shafts and gears
• Highly stressed machine parts
• Critical components in heavy machinery
• Aerospace structural components
• Aircraft landing gear components
• Defense industry applications
• Oil and gas industry components
• High-load bearings and rollers
• Crankshafts for high-performance engines
• Drive components in heavy equipment

Available Product Forms and Dimensions

FUSHUN METAL offers 1.6580 (30CrNiMo8) Alloy Steel in a wide range of forms to meet diverse application requirements:

Round Bar Specifications

Diameter (mm)	Standard Length (mm)	Surface Condition
10 – 250	3000, 6000, Fixed or Random	Black, Peeled, Turned, Ground, Polished

Flat Bar Specifications

Thickness (mm)	Width (mm)	Standard Length (mm)	Surface Condition
5 – 100	20 – 300	3000, 6000, Fixed or Random	Hot Rolled, Cold Drawn, Ground

Plate Specifications

Thickness (mm)	Width (mm)	Length (mm)	Surface Condition
5 – 100	Up to 2000	Up to 6000	Hot Rolled, Pickled, Ground

Custom Forms

FUSHUN METAL also offers 1.6580 (30CrNiMo8) in custom shapes, sizes, and pre-machined conditions to meet specific application requirements. Please contact our technical team for custom inquiries.

Technical Delivery Condition

FUSHUN METAL supplies 1.6580 (30CrNiMo8) in the following conditions:

• Quenched and Tempered: 800 – 1450 MPa
• Annealed (Soft): Max. 248 HB

Weldability

30CrNiMo8 is difficult to weld and should therefore not be used in welded constructions.

Hot Forming

30CrNiMo8 is hot formed at temperatures between 1100°C and 850°C and should be cooled slowly in the furnace afterward.

Physical Properties

1.6580 (30CrNiMo8) offers the following physical properties:

Property	Value
Density	7.76 kg/dm³
Modulus of Elasticity	210 × 10³ MPa
Electrical Resistance at 20°C	0.19 Ω mm²/m
Thermal Conductivity at 20°C	38.0 W/m·K
Specific Heat Capacity at 20°C	430 J/kg·K

Thermal Expansion Coefficient in Annealed Condition (10⁻⁶ K⁻¹)

Temperature Range	Coefficient (10⁻⁶ K⁻¹)
20 – 100°C	11.5
20 – 200°C	12.5
20 – 300°C	13.3
20 – 400°C	13.9

Mechanical Properties

1.6580 (30CrNiMo8) offers the following mechanical properties in quenched and tempered condition at room temperature:

Diameter (mm)	≤ 16	> 16 ≤ 40	> 40 ≤ 100
Yield Strength (MPa)	1050	1050	900
Tensile Strength (MPa)	1250 – 1450	1250 – 1450	1100 – 1300
Elongation (L₀ = 5d₀) (%)	9	9	10
Reduction of Area (%)	40	40	45
Impact Energy ISO-V (J)	30	30	35

Diameter (mm)	> 100 ≤ 160	> 160 ≤ 250
Yield Strength (MPa)	800	700
Tensile Strength (MPa)	1000 – 1200	900 – 1100
Elongation (L₀ = 5d₀) (%)	11	12
Reduction of Area (%)	50	50
Impact Energy ISO-V (J)	45	45

Note: These typical values apply to longitudinal specimens, which are taken from the core for diameters up to 25 mm, and from the edge zone with a distance of 12.5 mm from the edge for diameters over 25 mm. Different requirements can be considered upon request.

Heat Treatment Guidelines

Critical Temperatures: Ms: 340°C | AC1: 740°C | AC3: 810°C

Normalizing

• Normalizing should be carried out at temperatures between 850°C and 880°C followed by air cooling.
• Depending on the component dimensions, subsequent tempering may be necessary.

Soft Annealing

• Annealing is performed at temperatures of 650°C – 700°C followed by slow furnace cooling.

Quenching and Tempering

• Hardening should take place at temperatures of 830°C – 860°C followed by quenching in oil or aqueous polymer solution with comparable quenching effect.
• Tempering treatment should take place immediately after hardening to avoid the occurrence of cracks if possible.
• Tempering should be performed at temperatures between 540°C and 680°C followed by air cooling.

Hardening Parameters

• Hardening temperature: 850°C
• Tempering cross-section: Ø 60 mm
• Samples conventionally hardened in high-performance oil

Machining Recommendations

To achieve optimal results when machining 1.6580 (30CrNiMo8) steel, FUSHUN METAL recommends the following parameters:

Annealed Condition (≤ 248 HB)

Operation	Tool Material	Cutting Speed	Feed Rate	Coolant
Turning	Cemented Carbide P20-P30	110-140 m/min	0.2-0.4 mm/rev	Yes
Turning	High Speed Steel	20-30 m/min	0.1-0.3 mm/rev	Yes
Milling	Cemented Carbide P20-P40	100-130 m/min	0.1-0.3 mm/tooth	Yes
Drilling	High Speed Steel	18-22 m/min	0.05-0.15 mm/rev	Yes
Grinding	Aluminum Oxide Wheel	25-30 m/sec	–	Yes

Quenched and Tempered Condition

Operation	Tool Material	Cutting Speed	Feed Rate	Coolant
Turning	Cemented Carbide P10-P20	60-80 m/min	0.1-0.2 mm/rev	Yes
Milling	Cemented Carbide P10-P20	50-70 m/min	0.05-0.15 mm/tooth	Yes
Drilling	Cemented Carbide	40-60 m/min	0.05-0.12 mm/rev	Yes
Grinding	Aluminum Oxide Wheel	25-30 m/sec	–	Yes

Comparative Advantages

Understanding how 1.6580 (30CrNiMo8) compares to other grades helps in selecting the optimal material for your application:

Property	1.6580 (30CrNiMo8)	1.7225 (42CrMo4)	1.6523 (20NiCrMo2-2)
Alloy Content	High (Cr-Ni-Mo)	Medium (Cr-Mo)	Medium (Ni-Cr-Mo)
Strength Level	Very High	High	Medium
Hardenability	Excellent	Good	Good
Toughness	Excellent	Very Good	Excellent
Fatigue Resistance	Excellent	Good	Very Good
Machinability	Good	Very Good	Very Good
Weldability	Difficult	Limited	Moderate
Typical Applications	High-strength components, aerospace parts, heavy machinery	General engineering, shafts, gears	Case hardening parts, gears, shafts

Advantages of 1.6580 (30CrNiMo8)

1.6580 (30CrNiMo8) offers several key advantages that make it an excellent choice for demanding applications:

• Excellent Strength-to-Toughness Ratio: The combination of high strength (up to 1450 MPa) with good toughness makes this steel ideal for critical components.
• Superior Hardenability: The high alloy content ensures deep and uniform hardening even in large cross-sections.
• High Fatigue Resistance: Excellent performance under cyclic loading conditions.
• Good Impact Resistance: Maintains good impact properties even at high strength levels.
• Dimensional Stability: Minimal distortion during heat treatment due to balanced alloy content.
• Consistent Properties: Reliable mechanical properties throughout the cross-section.
• Good Wear Resistance: When properly heat treated, offers good resistance to abrasive and adhesive wear.

Quality Assurance

FUSHUN METAL maintains the highest quality standards for 1.6580 (30CrNiMo8) Steel:

• Material Certificates: EN 10204/3.1 certificates provided with chemical analysis and mechanical properties
• Testing: Comprehensive testing including ultrasonic testing and mechanical property verification
• Quality Management: ISO 9001 certified production processes
• Traceability: Full traceability from raw material to finished product
• Strict Production Control: Precise monitoring of melting, forging, and heat treatment processes

Why Choose FUSHUN METAL for 1.6580 (30CrNiMo8) Steel

When you select FUSHUN METAL as your supplier for 1.6580 (30CrNiMo8) Steel, you partner with a leading manufacturer committed to excellence:

• Material Expertise: Specialized experience in manufacturing high-strength alloy steels
• Advanced Production: State-of-the-art production facilities ensuring consistent quality
• Technical Support: Expert assistance in material selection and application guidance
• Custom Solutions: Ability to meet specific requirements for dimensions, tolerances, and mechanical properties
• Reliable Delivery: Efficient logistics and supply chain management
• Competitive Pricing: Excellent value without compromising on quality
• Global Service: Worldwide shipping capabilities with proper documentation

Request Information

Contact FUSHUN METAL today to discuss your 1.6580 (30CrNiMo8) Steel requirements. Our technical team is ready to assist you with:

• Detailed product specifications
• Technical consultations for your specific application
• Heat treatment recommendations for optimal properties
• Custom dimension and processing requirements
• Pricing inquiries and delivery schedules