Standards of screw spike

Grade description (technical requirements) of ASTM
1. AREA 4-1.4 in 1991 class 2 (ASTM 1183 Class2)
①Tensile strength (PSI)≥760MPa
②Yield strength≥552MPa
③Elongation2"≥12%
④Reduction of cross section≥25%
⑤Requirements of cold blending: 45°, no cracking. Diameter of blending core= diameter of screw
⑥Raw material: 35#, 45#, 20MnTiB, etc

2. AREA 1991 standard Strength Grade：SAE J429 Class 5
①1/4"~1" Tensile strength (PSI)≥828Mpa, Yield strength≥635MPa;
②>1"~1-1/2" Tensile strength (PSI)≥725Mpa, Yield strength≥559MPa;
③Elongation2"≥14%
④Reduction of cross section≥35%
⑤Requirements of cold blending: 45°, no cracking. 
Diameter of blending core= diameter of screw
⑥Surface hardness: HRC: size of 1/4～1"≤34; size of >1"~1-1/2"≤30;
⑦Core hardness: HRC: size of 1/4～1": 25~34; size of >1"~1-1/2"≤30 
(no requirements with the minimum hardness when examination);
⑧Raw material: 45#, 20MnTiB, 40Cr, etc
3. AREA 1991 standard Strength Grade：SAE J429 Class 8
①Tensile strength (PSI)≥1035.2MPa
②Yield strength≥897.2MPa
③Elongation2"≥12%
④Reduction of cross section≥35%
⑤Requirements of cold blending: 45°no cracking. 
Diameter of blending core= diameter of screw
⑥Surface hardness: HRC:≤39;
⑦Core hardness: HRC: 33~39; 
(no requirements with the minimum hardness when examination);
⑧Raw material: 45#, 35CrMo, 42CrMo, etc
Grade description (technical requirements) of GB, DIN, ISO
1. Grade: Class 4.6
①Raw material: Q235, Q275, 20#
②Mechanical capacity:
Tensile strength (PSI)≥400MPa
Yield strength≥240MPa
Elongation≥22%
Brinell Hardness HB114-209

2. Grade: Class 4.8
①Raw material: Q235, Q275
②Mechanical capacity:
Tensile strength (PSI)≥420MPa
Yield strength≥340MPa
Brinell Hardness HB124-209

3. Grade: Class 5.6
①Raw material: 35# Q345B（16Mn）
②Mechanical capacity:
Tensile strength (PSI)≥500MPa
Yield strength≥300MPa
Elongation≥20%
Brinell Hardness HB147-209

4. Grade: Class 5.8
①Raw material: 35#, 45# 
②Mechanical capacity:
Tensile strength (PSI)≥520MPa
Yield strength≥420MPa
Brinell Hardness HB151-209

5. Grade: Class 6.8
①Raw material: 45# 
②Mechanical capacity:
Tensile strength (PSI)≥600MPa
Yield strength≥480MPa
Brinell Hardness HB181-238

6. Grade: Class 8.8
①Raw material: 45# 40Cr 20MnTiB
②Mechanical capacity: 
A) Diameter≤16
Tensile strength (PSI)≥800MPa
Yield strength≥640MPa
Elongation≥12%
Reduction of cross section≥52%
Rockwell hardness HRC22-32
Brinell Hardness HB238-304
B) Diameter＞16
Tensile strength (PSI)≥830Mpa
Yield strength≥660MPa 
Elongation≥12% 
Reduction of cross section≥52%
Rockwell hardness HRC23-34
Brinell Hardness HB242-318

7. Grade: Class 10.9
①Raw material: 40Cr, 20MnTiB, 35CrMo, 42CrMo
②Mechanical capacity: 
Tensile strength (PSI)≥1040MPa
Yield strength≥940MPa
Elongation≥9%
Reduction of cross section≥48%
Rockwell hardness HRC32-39
Brinell Hardness HB304-361