●鋼號：SAE1020
●產(chǎn)品名稱：優(yōu)質碳素結構鋼
●執(zhí)行標準：SAE J403-2014
●數(shù)字代號：G10200
●交貨狀態(tài)：熱軋狀態(tài)交貨。
●鋼廠：鞍鋼、杭鋼、本鋼等。
●SAE1020用途、特性。
強度及硬度稍高于SAE1010鋼，塑性、焊接性均好，熱軋或正火后韌性好，經(jīng)熱處理后可改善可切削性，無回火脆性。
●SAE1020用舉例：
用做受力不大但是要求較高韌性的各種機械零件，如：杠桿、螺釘、起重鉤、軸套、鏈輪等。
●SAE1020化學成份范圍值:
注：實際化學成分以鋼廠質保書為準。
碳C：0.18～0.23
硅Si：0.20～0.40
錳Mn：0.30～0.60
硫S ：≤0.05
磷P ：≤0.03
銅Cu：≤0.20
●SAE1020力學性能范圍值:
注：實際力學性能以鋼廠質保書為準。
SAE1020抗拉強度σb(MPa)：≥415
SAE1020屈服強度σs(MPa)：≥245
SAE1020伸長率δ5(%)：≥25
SAE1020斷面收縮率ψ(%)：≥55
SAE1020出廠熱處理硬度：≤1155HBW
SAE1020試樣尺寸：試樣毛坯尺寸為19.8mm
SAE : Society of Automotive Engineers(美國機動車工程師學會)。
SAE1006~1020屬于優(yōu)質碳素結構鋼,相當于中國GB:08F~20#鋼。這種鋼的含硫量ws在0.08%~0.30%范圍內，含錳量wMn在0.60%~1.55%范圍內。
鋼中的硫和錳以硫化錳形態(tài)存在，硫化錳很脆并有潤滑效能，從而使切屑容易碎斷，并有利于提高加工表面的質量 。
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.
The data sheet below lists SAE AISI 1020 steel properties including chemical composition, physical and mechanical properties, etc.
| AISI SAE 1020 Steel Chemical Composition (%) | ||||
| AISI | C | Mn | P (≤) | S (≤) |
| 1020 | 0.18-0.23 | 0.30-0.60 | 0.040 | 0.050 |
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
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.) |
| 420 (61) | 350 (51) | 15 | 41 | 121 | Cold drawn | ||
| 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 |
AISI SAE 1020 carbon steel machinability rating is 65 based on a machinability rating of 100% for 1212 steel.
The heat treatment of SAE AISI 1020 mild steel including normalizing, annealing, austenitizing, etc.
The typical normalizing temperature for SAE AISI 1020 mild steel is 915 °C (1675 °F).
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) 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).
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 forging temperature for AISI 1020 mild steel is 1290 °C (2350 °F).
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).
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.
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 | ||
對應標準及相關文件的PDF格式下載：
SAE-1045-Chemical-Compositions.pdf
SAE-J403-Chemical-Compositions-Carbon-Steels.PDF
SAE-1040-Chemical-Compositions.pdf
SAE-1035-Chemical-Compositions.pdf
SAE-1022-Chemical-Compositions.pdf
SAE-1012-Chemical-Compositions.pdf
SAE-1018-Chemical-Compositions.pdf
SAE-1020-Chemical-Compositions.pdf
SAE-1010-Chemical-Compositions.pdf
SAE J403 REV NOV[1]. 2001 美國碳素結構鋼化學成分標準 XZ.pdf
SAE J403_2014 06 Chemical Compositions of SAE CarbonSteels.pdf
