1.4938, X12CrNioMV12-3, AMS 5719, Creep Resisting

1.4938, X12CrNiMoV12-3, AMS 5719, Creep Resisting
STEELMAX Steel Story

1.4938 은, 내크리프 (creep resistance) 스텐레스 강재입니다.
EN 10269 — fasteners, EN 10302 — creep resisting steel 규정 재질입니다.

550℃ 까지 사용 가능한 elevated temperature and/or low temperature,
Quenching and Tempering 열처리 가능하고, 좋은 인성 (toughness),

높은 응력 (high stress)를 받는 곳에 사용합니다.
bolts, aerospace industry, 발전소의 turbine blades 용도입니다.

1.4938 재질은 EN 1.4933, AMS 5719, ASTM A565 XM-32 재질과 비교되며
경우에 따라 청정강 생산 방법인 ESR, VAR (vacuum arc remelting) 적용됩니다.

※ Creep resistance
a property of resistance against a phenomenon in which
strain in the lapse of time under a fixed stress at a high
temperature called high temperature creep.

고온의 일정한 압력을 받는 환경에서 물질의 변형이
시간이 경과함에 따라 증가하는 현상을 고온 크립이라고 하고
이에 견디는 성질을 말합니다.

※ Toughness (인성 : 靭性)
The degree of difficulty in occurring impact breaking
because of the material’s toughness .
질기고 세며, 충격 파괴를 일으키기 어려운지, 어떤지의 정도.

※ ESR (Electro Slag Remelting : 일렉트로 슬래그 재 용해)
After casting, the ingot is remelted from bottom to top by electric energy,
During this process, the melted steel falls through slags, which collects
almost all of the non-metallic inclusions
A new ingot solidifies from bottom to top and there is very little segregation
from case to core.
The fatigue resistance and in particular the toughness increase.
Even through ESR increases material costs, it can still be economical due to
the increase in the tool’s performance.
Metal injection moulds and extrusion dies often need ESR steel grades.

1.4938, X12CrNiMoV12-3, d≤160, EN 10302
Chemical composition (%)	Carbon (C)	0.08~0.15
	Silicon (Si)	0.50 max
	Manganese (Mn)	0.40~0.90
	Phosphorus (P)	0.025 max
	Sulfur (S)	0.015 max
	Chromium (Cr)	11.0~12.5
	Molybdenum (Mo)	1.50~2.00
	Nickel (Ni)	2.00~3.00
	Vanadium (V)	0.25~0.40
	Nitrogen (N)	0.020~0.040
Proof strength (MPa)		760 min
Tensile strength (MPa)		930~1130
Elongation (%)		14 min
Elongation after fracture (%)		40 min
Impact energy(ISO-V) at 20℃		40 min