SAE AISI 1080 Steel Properties Heat Treatment Composition Rockwell Hardness

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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 1080 carbon steel chemical composition, physical properties, mechanical properties, heat treatment and applications, etc.

Datasheet and Specification

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

Chemical Composition

The table below lists 1080 steel chemical composition based on heat analysis.

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

1080 Steel Properties

AISI 1080 steel properties are given in the datasheet below, including physical properties, mechanical properties.

Mechanical Properties

1080 mechanical properties in different conditions are summarized in the datasheet below.

1080 steel properties – 1

AISI ASTM 1080 mechanical properties in heat-treated or cold-worked conditions
Steel (UNS) Tensile strength, MPa (ksi) Yield strength, MPa (ksi) Elongation in 50 mm, % Reduction in area, % 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 Spheroidized annealed, cold drawn

1080 steel properties – 2

AISI 1080 mechanical properties in the hot-rolled, normalized, and annealed condition
UNS Steel Tensile strength, MPa (ksi) Yield strength, MPa (ksi) Elongation in 50.8 mm (2 in.), % Reduction in area, % Hardness (HB) Processing, condition or treatment Austenitizing temperature, °C (°F) Quenching agent Izod impact strength, J, (ft·lbf) Sample Size
UNS G10800 1080 965 (140.0) 586 (85.0) 12 17 293 As-rolled Oil 7 (5) 12.8 mm (0.505 in.) machined from 25.4 mm (1 in.) rounds.
1013 (147.0) 524 (76.0) 11 20.6 293 Normalized 900 (1650) Oil
615 (89.3) 376 (54.5) 24.7 45 174 Annealed 790 (1450) Oil

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

Grade 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

Grade After tempering for 2 h at °C (°F) Heat treatment Rockwell C hardness, HRC
1080 205 (400) Normalized at 885 °C (1625 °F), water quenched from 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

1080 steel physical properties -5

AISI SAE 1080 coefficients of linear thermal expansion
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)
Material 1080 thermal conductivity
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 AISI SAE 1080 Carbon Steel
Value (μΩ·m) Temperature, °C (°F)
0.18 20 (68)

1080 Steel Heat Treatment

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

Normalizing

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

Full Annealing

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

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

Austenitizing

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

Hardening

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

Forging

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

Machinability

The machinability rating of 1080 nonresulfurized carbon steel bar is 45% in spheroidized annealed and cold drawn condition, based on cold drawn 1212 steel machinability as 100%.

Applications

Such as hitting tools, ring rolling tools, springs, wear parts, hand tools, and agricultural implements.

1080 High Carbon Steel Equivalent Grade

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.

AISI 1080 equivalent material
US Germany China Japan ISO
Standard Grade (UNS) Standard Grade (Steel Number) Standard Grade Standard Grade Standard Grade
AISI, SAE; ASTM A29/A29M 1080 (UNS G10800) GB/T 699 80 steel

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