34CrAlNi7-10, DIN EN 10085, 1.8550 Nitriding Steel

34CrAlNi7-10, DIN EN 10085, 1.8550 Nitriding Steel
STEELMAX Steel Story

이 강종은 질화강입니다.
질화강이란 알루미늄 (Al), 크롬 (Cr),

몰리브덴(Mo)을 함유하며,
질화 처리하여, 표면 경화를 시킨 강을 말합니다.

철강재 표면에 질소 (N) 농도를 높이는 열 화학적 처리를 말하며
질화에 사용되는 매질은 가스, 프라즈마 방법이 있습니다.

Nitrogen (N)은 강 (steel)의 강도 (strength), 경도 (hardness),
기계 가공성 (machinability) 을 높여주지만, 반대로

연성 (Ductile)과 인성 (Toughness) 을
감소 시키는 합금 원소입니다.

질화강에 Al, Cr, Ti, V, Mo를 합금 시키는 이유는
이들 원소가 경화를 돕는 원소이기 때문입니다.

질소 (Nitrogen) 를 강재 표면에 침입, 확산 시킨
질화 처리된 강은 HV 800~1000 수준이며

내열성, 내마모성, 내식성, 고온 내피로성,
고온 강도를 유지하는 강재가 됩니다.

Use barrels and screws for injection molding machines,
plungers, piston rods, parts of general engineering.

Standard		DIN EN 10085 (2013-10)
Material No.		1.8519	1.8523	1.8550
Steel name		31CrMoV9	40CrMoV13-9	34CrAlNi7-10
Chemical Composition (%)	Carbon (C)	0.27~0.34	0.36~0.43	0.30~0.37
	Silicon (Si)	0.40 max	0.40 max	0.40 max
	Manganese (Mn)	0.40~0.70	0.40~0.70	0.40~0.70
	Phosphorus (P)	0.025 max	0.025 max	0.025 max
	Sulfur (S)	0.035 max	0.035 max	0.035 max
	Aluminum (Al)	–	–	0.80~1.20
	Chromium (Cr)	2.30~2.70	3.00~3.50	1.50~1.80
	Molybdenum (Mo)	0.15~0.25	0.80~1.10	0.15~0.25
	Nickel (Ni)	–	–	0.85~1.15
	Vanadium (Ni)	0.10~0.20	0.15~0.25	–
16≤D≤40	Yield (㎫)	900	750	680
16≤D≤40	Tensile (㎫)	1100~1300	950~1150	900~1100
40＜D≤100	Yield (㎫)	800	720	650
40＜D≤100	Tensile (㎫)	1000~1200	900~1100	850~1050
100＜D≤160	Yield (㎫)	700	700	600
100＜D≤160	Tensile (㎫)	900~1100	870~1070	800~1000
160＜D≤200	Yield (㎫)	650	625	600
160＜D≤200	Tensile (㎫)	850~1050	800~1000	800~1000
Surface Hardness(HV)		800	–	950
Actual surface hardness may vary with nitriding treatment and initial QT condition

Nitriding Steel
bisher (Old)			neu (New) 2013-10
Material No.	Code(약호)	Standard	Material No.	Code(약호)	Standard
1.8519	31CrMoV9	DIN 17211	1.8519	31CrMoV9	EN 10085
1.8523	39CrMoV13-9	DIN 17211	1.8523	40CrMoV13-9	EN 10085
1.8550	34CrAlNi7	DIN 17211	1.8550	34CrAlNi7-10	EN 10085

※ Ductility (연성 : 延性)
The property of metals that enables them to be
mechanically deformed when cold, without fracture.
In steel, ductility is usually measured by elongation
and reduction of area is determined in a tensile test.

※ Toughness (인성 : 靭性)
The degree of difficulty in occurring impact breaking
because of the material’s toughness.

※ Nitriding (질화 처리 : 窒化處理)

It is a heat treatment process for surface hardening.
Nitriding is an accumulation of nitrogen in the tool surface by
diffusion at a process temperature between 430~630℃.
When it is done with a secondary hardened tool steel below 500℃,
there will be no distortion on the nitriding pieces.
Today we use gas nitriding, salt bath nitriding, plasma nitriding.
Recently plasma nitriding has become very popular because it is
possible to reduce the nitriding temperature to a lower level
and this process has the best environmental assessment.
Nitriding a tool is a good possibility of increasing the wear
resistance of the surface still having a tough core.