SAE1020 是什么材料？有什么特性？（ASTM SAE AISI 1020 Steel）

作者：董经理¹³³³⁷⁸⁸³⁰⁸⁶ 更新时间：2023-04-28 点击数：

SAE1020 是什么材料？有什么特性？

SAE1020_SAE1020是什么材料_SAE1020热处理硬度多少？

●钢号：SAE1020
●产品名称：优质碳素结构钢
●执行标准：SAE J403-2014
●数字代号：G10200
●交货状态：热轧状态交货。
●钢厂：鞍钢、杭钢、本钢等。

●SAE1020用途、特性。
强度及硬度稍高于SAE1010钢，塑性、焊接性均好，热轧或正火后韧性好，经热处理后可改善可切削性，无回火脆性。

●SAE1020用举例：
用做受力不大但是要求较高韧性的各种机械零件，如：杠杆、螺钉、起重钩、轴套、链轮等。

●SAE1020化学成份范围值:
注：实际化学成分以钢厂质保书为准。
碳C：0.18～0.23
硅Si：0.20～0.40
锰Mn：0.30～0.60
硫S ：≤0.05
磷P ：≤0.03
铜Cu：≤0.20

●SAE1020力学性能范围值:
注：实际力学性能以钢厂质保书为准。
SAE1020抗拉强度σb(MPa)：≥415
SAE1020屈服强度σs(MPa)：≥245
SAE1020伸长率δ5(%)：≥25
SAE1020断面收缩率ψ(%)：≥55

SAE1020出厂热处理硬度：≤1155HBW

SAE1020试样尺寸：试样毛坯尺寸为19.8mm

SAE : Society of Automotive Engineers(美国机动车工程师学会)。

SAE1006~1020属于优质碳素结构钢,相当于中国GB:08F~20#钢。这种钢的含硫量ws在0.08%~0.30%范围内，含锰量wMn在0.60%~1.55%范围内。

钢中的硫和锰以硫化锰形态存在，硫化锰很脆并有润滑效能，从而使切屑容易碎断，并有利于提高加工表面的质量。

英文说明：

SAE AISI 1020 Steel Properties, C1020 Carbon Steel Yield Strength, Equivalent

ASTM SAE AISI 1020 Steel

AISI 1020 steel is also known as C1020 steel in cold worked (cold rolled or cold drawn) condition. 1020 carbon steel is one of the most commonly used plain carbon steels, has good machinability and weldability. SAE AISI 1020 mild steel can be hot rolled or cold drawn, but it is usually in turned and polished or cold drawn conditions. Due to its low carbon content, it is resistant to induction hardening or flame hardening.

AISI SAE 1020 Steel Properties & Specification

The data sheet below lists SAE AISI 1020 steel properties including chemical composition, physical and mechanical properties, etc.

Chemical Composition

	AISI SAE 1020 Steel Chemical Composition (%)
AISI	C	Mn	P (≤)	S (≤)
1020	0.18-0.23	0.30-0.60	0.040	0.050

Physical Properties

Melting point: 1515 °C (2760 °F)

Density of 1020 steel: 7.87 g/cm3 (0.0361 lbs/in3)

Material 1020 thermal conductivity
Value (W/m·K)	Temperature, °C (°F)
51.9	0 (32)
51.0	100 (212)
48.9	200 (392)

Specific Heat
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 1020 Carbon Steel
Value (μΩ·m)	Temperature, °C (°F)
0.159	0 (32)
0.219	100 (212)
0.292	200 (392)

Coefficients of linear thermal expansion
Value (10-6/K)	Temperature, °C (°F)	Treatment or condition
11.7	20-100 (68-212)	Annealed
12.1	20-200 (68-392)
12.8	20-300 (68-572)
13.4	20-400 (68-752)
13.9	20-500 (68-932)
14.4	20-600 (68-1112)
14.8	20-700 (68-1292)

Notes: 10-6/K = 10-6.K-1 = (µm/m)/°C

Mechanical Properties of SAE AISI 1020 Mild Steel

The following data shows that AISI SAE 1020 steel mechanical properties include yield strength, tensile strength, elongation, section reduction, and hardness in various conditions.

SAE AISI 1020 carbon steel Young’s modulus (modulus of elasticity) in the as-received condition: 186 GPa (27×106 psi).

AISI 1020 steel mechanical properties in heat-treated or cold-worked conditions
AISI (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.)
1020 (G10200)	380 (55)	205 (30)	25	50	111	Hot rolled	19-31.8 mm (0.75-1.25 in.)
1020 (G10200)	420 (61)	350 (51)	15	41	121	Cold drawn	19-31.8 mm (0.75-1.25 in.)

Mechanical properties in the hot-rolled, normalized, and annealed condition
AISI	Tensile strength, MPa (ksi), ≥	Yield strength, MPa (ksi), ≥	Elongation in 50 mm, %, ≥	Reduction in area, %, ≥	Hardness (HB)	Processing, condition or treatment	Austenitizing temperature, °C (°F)	Quenching agent	Izod impact strength, J, (ft·lbf)	Sample Size
1020	448 (65)	331 (48)	36	59	143	As-rolled	–	Oil	87 (64)	12.8 mm (0.505 in.) machined from 25.4 mm (1 in.) rounds.
	441 (64)	346.5 (50.3)	35.8	68	131	Normalized	870 (1600)	Oil	118 (87)
	394.7 (57.3)	295 (43)	36.5	66	111	Annealed	870 (1600)	Oil	123 (91)

		Cyclic fatigue properties
UNS	Grade	Cyclic strength coefficient, MPa (ksi)	Fatigue strength coefficient, MPa (ksi)	Fatigue strength exponent	Fatigue ductility coefficient	Fatigue ductility exponent	Hardness (HB)
G10200	SAE 1020 steel	1205 (175)	850 (123)	-0.12	0.44	-0.51	108

Machinability

AISI SAE 1020 carbon steel machinability rating is 65 based on a machinability rating of 100% for 1212 steel.

SAE AISI 1020 Steel Heat Treatment

The heat treatment of SAE AISI 1020 mild steel including normalizing, annealing, austenitizing, etc.

Normalizing of AISI 1020

The typical normalizing temperature for SAE AISI 1020 mild steel is 915 °C (1675 °F).

Annealing of AISI 1020

Recommended temperature and cooling cycle for full annealing of small carbon steel forgings (size ≤ 3 in.):

Annealing temperature is 855-900 °C (1575-1650 °F), cooling cycle is from 855 °C (1575 °F) to 700 °C (1290 °F), furnace cooling speed at 28 °C/h (50 °F/h), Brinell hardness is 111-149 HB.

Reheating (Austenitizing)

Reheating (austenitizing) temperatures for hardening of SAE 1020 steel is 760-790 °C (1400-1450 °F). Carburizing is commonly carried out at 900 to 925 °C (1650 to 1700 °F).

Case Hardening

The surface hardening carburization temperature of 1020 carbon steel is 970-955 °C, and most of them are carried out in a mixed gas of methane and carrier gas. Hardening after carburizing is usually achieved by direct quenching from the carburizing temperature into water or brine.

Typical heat treatment for SAE 1020 case hardening

Carbon temperature: 900-925 °C (1650-1700 °F), cooling method: water or caustic;
Reheat temperature: 790 °C (1450 °F), cooling method: water or 3% sodium hydroxide;
Carbonitriding temperature: 790-900 °C (1450-1650 °F), cooling method: oil;
Temper temperature: 120-205 °C (250-400 °F), for stress relief and improving resistance to cracking (not mandatory).

Typical Forging Temperature

Typical forging temperature for AISI 1020 mild steel is 1290 °C (2350 °F).

AISI 1020 Carbon Steel Welding

The recommended preheat and interpass temperatures for AISI SAE C1020 steel:

For thickness ≤50mm (2 in.), the recommended preheat and interpass temperature is above -12 °C (for low hydrogen); and 38 °C for other than low hydrogen.

For thickness (t) 50< t ≤100, the recommended preheat and interpass temperature is 93 °C (for low hydrogen); and 150 °C (for other than low hydrogen).

Postweld heat treatment is optional, temperature is 590-675 °C (1100-1250 °F).

Application

ASTM AISI SAE 1020 steel has many semi-finished products, such as square steel bars, flat steel bars, round steel bars, steel plates, which can be used to make truck, automotive and agricultural equipment parts such as axles, mechanical parts, cold head bolts, motor shafts, pump shafts, ratchet, light gear, gear drives, worm gear, spindle, seat bracket, crane-cable drum, motor-brake wheel, etc. And usually also made into steel channels, steel angles, I-beams and H-beams.

AISI SAE ASTM 1020 Steel Equivalent Material

SAE ASTM AISI 1020 carbon steel equivalent to European EN (Germany DIN EN, British BSI, French NF…), Japanese JISand Chinese GB standard.

AISI SAE ASTM 1020 steel equivalent material
US				Germany		China		Japan		ISO
Standard	AISI (UNS)	Standard	Grade	Standard	Grade (Material Number)	Standard	Grade	Standard	Grade	Standard	Grade
AISI SAE; ASTM A29/A29M	1020 (G10200)	AMS	5032D; 5045E; 5046	DIN EN 10083-2; DIN EN 10250-2	C22E (1.1151); C22 (1.0402)	GB/T 699	20 steel	JIS G4051	S20C