1.7729, 20CrMoVTiB4-10 +QT, Alloy Steel Fastener

1.7729, 20CrMoVTiB4-10 +QT, Alloy Steel for Fasteners
STEELMAX Steel Story

1.7729, 20CrMoVTiB4-10 강재는 550℃ 까지
0.2% 항복강도 규정이 있는 볼트용 강재입니다.

1% Chromium, 1% Molybdenum,
0.70% 수준의 Vanadium 합금 강재 입니다.

Quenching and Tempering 열처리 하면
항복강도 660MPa minimum,

인장강도 820~1000 MPa,
minimum 강재 입니다.

DIN-EN 10206 European Standard Specifies requirements for
semi-finished products, bars and rods for fasteners with

properties specified at elevated and/or low temperature made of
non-alloy and alloy(including stainless) steels and nickel alloys

EN10269 자주 사용하는 Steel for Fasteners DIN-EN Spec

Alloy Steel
25CrMo4 (1.7218), 42CrMo4 (1.7225), 40CrMoV4-6 (1.7711)

21CrMoV5-7 (1.7709), 20CrMoVTiB4-10 (1.7729)
34CrNiMo6 (1.6582), 30CrNiMo8 (1.6580)

Stainless
X22CrMoV12-1 (1.4923), X6NiCrTiMoVB25-15-2

※ Reduction of area (RA : 斷面收縮率 : 단면 수축율)
Percentage of the difference between the minimum sectional
area after fracture and the original sectional area of test piece
to the original sectional area.
In KS and JIS, it is required only for test pieces with
circular section.

시험편 파단 후의 최소 단면적과 그 원단면적의 차를
원단면적에 대한 백분율로 나타낸 것.
KS, JIS에서는 원형 단면의 시험편에서 비율을 구한다.

1.7729 (20CrMoVTiB4-10)+QT Condition
Chemical composition (%)	Carbon (C)	0.17~0.23
	Manganese (Mn)	0.35~0.75
	Phosphorus (P)	0.020 max
	Sulfur (S)	0.020 max
	Silicon (Si)	0.40 max
	Aluminum total	0.015~0.080
	Boron (B)	0.001~0.010
	Chromium (Cr)	0.90~1.20
	Molybdenum (Mo)	0.90~1.10
	Nickel (Ni)	0.20 max
	Vanadium (V)	0.60~0.80
	Titanium (Ti)	0.07~0.15
	Arsenic (As)	0.020 max
	Tin (Sn)	0.020 max
	Copper (Cu)	0.020 max
Yield strength (MPa, min)	D≤160	660
Tensile strength (MPa)	D≤160	820~1000
Elongation (%, min)	D≤160	15
Reduction area (%, min)	D≤160	50
Impact energy (J, min)	D≤100	40
Impact energy (J, min)	100＜D≤160	27