Dureza de Rockwell da composição do tratamento térmico das propriedades do aço do SAE AISI 1080

SAE AISI 1080 Steel Properties Heat Treatment Composition Rockwell Hardness

AISI 1080 steel bar, 1080 carbon steel

ASTM SAE AISI 1080 High Carbon Steel

ASTM SAE AISI 1080 steel is a high carbon steel with a carbon content of 0.75-0.88%. This article summarizes the chemical composition of 1080 carbon steel, physical properties, mechanical properties, heat treatment and applications, etc.

Datasheet and specification

The following tables summarize the ASTM SAE AISI 1080 steel data sheet, including chemical composition, physical properties, mechanical properties and heat treatment.

Chemical composition

The table below lists the chemical composition of 1080 steel based on thermal analysis.

Chemical Composition of AISI 1080 (%)
ASTM UN Steel Grade W Mn P(≤) S (≤)
ASTM A29/A29M UNS G10800 1080 0.75-0.88 0.60-0.90 0.040 0.050

Properties of 1080 steel

The properties of AISI 1080 steel are given in the data sheet below, including physical properties and mechanical properties.

Mechanical properties

1,080 mechanical properties under different conditions are summarized in the data sheet below.

1080 properties of steel – 1

AISI ASTM 1080 mechanical properties under heat treatment or cold working conditions
Steel (UNS) Tensile strength, MPa (ksi) Yield strength, MPa (ksi) Elongation by 50 mm, % Area reduction, % Hardness (HB) Processing, condition or treatment Sample size, mm (in.)
1080 (UNS G10800) 770 (112) 425 (61.5) 10 25 229 Hot rolled 19-31.8 (0.75-1.25 in.)
675 (98) 515 (75) 10 40 192 Spheroid annealed, cold drawn

1080 properties of steel – 2

Mechanical properties of AISI 1080 in hot rolled, normalized and annealed condition
UN Steel Tensile strength, MPa (ksi) Yield strength, MPa (ksi) Elongation by 50.8 mm (2 in.), % Area reduction, % Hardness (HB) Processing, condition or treatment Austenitizing temperature, °C (°F) Quenching agent Impact resistance Izod, J, (ft·lbf) Sample size
UNS G10800 1080 965 (140.0) 586 (85.0) 12 17 293 How it happened Oil 7 (5) 12.8 mm (0.505 in.) machined to 25.4 mm (1 in.) circles.
1013 (147.0) 524 (76.0) 11 20.6 293 Standardized 900 (1650) Oil
615 (89.3) 376 (54.5) 24.7 45 174 Annealed 790 (1450) Oil

Properties of 1080 steel 3 (hardness), Effect of mass on the hardness of normalized 1080 steel bar.

Note Normalizing temperature °C (°F) Diameter, mm (in.) Brinell Hardness, HB
1080 900 (1650) 13 (0.5) 293
25.4 (1) 293
50.8 (2) 285
100 (4) 269

Typical hardness of 1080 carbon steel after tempering

Note After tempering for 2 h °C (°F) Heat treatment Rockwell hardness C, HRC
1080 205 (400) Normalized to 885°C (1625°F), water quenched to 800-815°C (1475-1550°F); average dew point at 7°C (45°F) 57
260 (500) 55
315 (600) 50
370 (700) 43
425 (800) 41
480 (900) 40
540 (1000) 39
595 (1100) 38
650 (1200) 32

Physical properties

Physical Properties of Steel 1080 -5

AISI SAE 1080 linear thermal expansion coefficients
μm/m·K (10-6/K) Temperature, °C (°F) Treatment
or condition
11.0 20-100 (68-212) Annealed
11.6 20-200 (68-392)
12.4 20-300 (68-572)
13.2 20-400 (68-752)
13.8 20-500 (68-932)
14.2 20-600 (68-1112)
14.7 20-700 (68-1292)
Thermal conductivity of material 1080
Value (W/m·K) Temperature, °C (°F)
50.5 0 (32)
46.8 200 (392)
Specific heat of AISI 1080 carbon steel
Value (J/Kg·K) Temperature, °C (°F)
486 50-100 (122-212)
519 150-200 (302-392)
599 350-400 (662-752)
Electrical Resistivity of Carbon Steel AISI SAE 1080
Value (μΩ·m) Temperature, °C (°F)
0.18 20 (68)

1080 Steel Heat Treatment

The heat treatment of AISI 1080 steel includes normalizing, annealing, austenitizing and hardening, etc.

Normalizing

The typical normalizing temperature for 1080 carbon steel is 830°C (1525°F).

Complete Annealing

The full annealing temperature for 1080 steel is 790-845°C (1450-1550°F).

For small 1080 steel forgings: cool cycle from 790°C (1450°F) to 650°C (1200°F) at a rate of 28°C/h (50°F/h) in the oven at Full range annealing. (For section thickness ≤ 75 mm, the full annealing temperature is at least 1 hour for thickness ≤ 25.4 mm, 0.5 hour is added for each additional thickness of 25.4 mm)

Austenitization

The austenitizing temperature for direct hardening is 790-815°C (1450-1500°F).

Hardening

Heat to 815°C (1500°F). The quenching medium is water or brine. Oil quenching is used when the section thickness is less than 6.35 mm (0.25 in). Rockwell C hardness after quenching is about 65 HRC. Hardness can be reduced by appropriate tempering.

Forging

Typical forging temperature is 1205°C (2200°F).

Machinability

The machinability rating of 1080 non-resulfurized carbon steel bar is 45% in spheroid annealed and cold drawn condition, based on the machinability of cold drawn 1212 steel as 100%.

Forms

Such as impact tools, ring rolling tools, springs, wearing parts, hand tools and agricultural implements.

High Carbon Steel Equivalent Grade 1080

ASTM AISI SAE 1080 steel equivalent to European EN standards (German DIN EN, British BS EN, French NF EN…), Chinese GB standards, ISO and Japanese JIS standards.

Material equivalent to AISI 1080
USA Germany China Japan ISO
Standard Note (UNS) Standard Class (Steel Number) Standard Note Standard Note Standard Note
AISI, SAE; ASTM A29/A29M 1080 (UNS G10800) GB/T 699 80 steel

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