4140 flat bar | 4140 flat bar Supply Range | SAE 4140 flat bar material

Product name

AISI 4140 Knife Steel - SAE 4140 Steel Round Bar - ASTM 4140 Heat Treatment Steel

keyword

4140 steel round bar,4140 heat treatment,4140 knife

Standard

AISI/ASTM/DIN/NF/JIS/GB/BS

Steel Grade

AISI 4140/ASTM 4140/DIN 1.7225 /NF 40CD4 /JIS SCM440 /GB 42CrMo /BS 708M40

Chemical Compositions(%)

C: 0.38-0.45 Si: 0.17-0.37 Mn: 0.50-0.80 P≤0.035 S ≤0.035

Cr: 0.90-1.20 Mo: 0.15-0.25

Mechanical properties

Tensile strength σb (MPa): ≥1080(110)

Yield strength σs (MPa): ≥930(95)

Elongation δ5 (%): ≥12

Area shrinkage ψ (%): ≥45

Impact energy Akv (J): ≥63

Impact toughness value αkv (J/cm2): ≥78(8)

Hardness: ≤217HB

Sample size: sample blank size is 25mm

Surface treatment

Black/Peeling/Polishing/Machined

Technique

Cold/Hot rolled, Cold-Drawn or Hot Forged

Heat Treatment

Annealed; Quenched; Tempered

Delivery Condition

Hot Rolled or Forged/Peeled or Black Surface/Annealed or QT

Heat treatment standard

Quenching at 850℃, oil cooling; tempering at 560℃, water cooling, oil cooling

Metallograc structure

Tempered sorbite

Test

SGS/UT100%//span>

Certificate

SGS/ISO/Mill Certificate

Delivery status

Delivered in heat-treated (normalized, annealed or high temperature tempered) or unheated state

Wechat

+8

Company website