Hot forged flat bars
Grade: SNCM439
Similar grade: SAE4340, 34CrNiMo6, 718M40
Steel Ingot: EAF+LF+VD
Chemical compostion:
C: 0.36/0.43; Si: 0.15-0.35; Mn: 0.60/0.90; P: Max 0.025; S: 0.020/0.035;
Cr: 0.60/1.00, Mo: 0.15/0.30; Ni: 1.60/2.00; Al: 0.02/0.05;
Standard: JIS
Grain Size: 6-8
Brinell Hardness: Quenched and tempered: 280HB-320HB
Delivery condition: Hot forged +Normalizing/Annealing+Rough Turned+ Quenching+ Tempering, .
Or Only forged of black surface bars.
Size: 150x150-650x650
Size tolerance: -0/+10mm;
Deviation: Max. 2%, Corner " R": 3-5mm, Max ( Aiming Shape Corner )
Length: 4.0m and up(Or fix length according the customer requirement).
Ultrasonic test: According to SEP 1921 C/c, D/d, E/e, A388 or GB/T 6402
Cut both ends
Other Steel Grade:
Carbon Steel: S20C, S26C, S35C, S45C, S50C, S55C, S60C;
Alloy Steel: SCM440, SCM420, SCM435, SCM415, SNCM220, SNCM439, SACM 645;
Tool Steel: SKD61.
Manufacturer: Jiangsu Zhuhong Forging Co., Ltd