Chronifer® M-17C, AISI 440C, Martensitic

Chronifer® M-17C, AISI 440C, Martensitic
STEELMAX Steel Story

Chronifer® M-17C 스텐레스는 Martensitic 조직이면서
nominal 17% Chromium 합금으로 특징 되는 스텐레스입니다.

Chronifer® M-17C 재질은 높은 탄소량 (0.95~1.20%)으로
304 스텐레스보다는 내식성에서 떨어지지만,

높은 강도가 필요할 때 선정되는 Bars, Wires 형태 제품입니다.
Chronifer® M-17 는, Cold drawn, Ground polished h8, h6 수준의

표면 마무리 tolerance 이며, 의료용, 치과용, 외과용 도구
노즐과 제지 산업, 절단용 공구 용도로 사용됩니다.

Chronifer M-17C 재질은 AISI 440C, EN 1.4125,
X105CrMo17, UNS S44004 재질과 비교 가능합니다.

※ Cold Finish
The term “Cold Finish” is an umbrella definition for any metal
that has had some sort of surface treatment.
EX) Cold drawn is cold finish surface.
Centerless Ground, Smooth Turned, and Rough Turned — These are all “Cold Finish”

※ Drawing (인발 : 引拔)
The process of pulling material through a die to reduce the size,
change the cross sectional shape, or to harden the material
소재를 잡아 당겨, 다이를 통과시키면서 단면적이나 크기를
줄여 나가거나, 금속을 경화 시키기도 하는 방법

※ 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.

※ Non-metallic inclusion (비금속 개재물 : 非金屬介在物)
Non-metallic inclusion precipitated or dragged into
a steel in solidifying of steel
The inclusions are examined by macro-structure examination and
micro-structure examination and the inclusions
of the former are defined as non-metallic
are defined as non-metallic inclusions visible with naked eyes

강의 응고 과정에서 강 안에 석출 또는 혼입 되어 들어가는
비금속성의 개재물로 매크로 조직 시험으로 조사하는데
앞에서 말한 개재물이란 육안으로 인지 되는
비금속 개재물을 말합니다.

※ Inclusions (개재물 : 介在物)
Non metallic particles like oxides, sulfides, and silicates in the steel matrix.
To decrease the negative effect of inclusions on mechanical properties,
special cleaning methods are used during the melting process in
steel production.

산화물, 황화물, 규산염 등의 아주 작은 입자들이 금속 조직 내 있는 것을 말하고
이들은 기계적 성질에 부정적인 영향을 감소 시키려고 강의 제조 과정에서
제거 시킵니다.

CHRONIFER® M-17C, 440C ESR
Chemical composition (%)	Carbon (C)	0.95~1.20
	Manganese (Mn)	1.00 max
	Phosphorus (P)	0.040 max
	Sulfur (S)	0.030 max
	Silicon (Si)	1.00 max
	Chromium (Cr)	16.0~18.0
	Molybdenum (Mo)	0.40~0.75
	iron (Fe)	balance
Mechanical properties	d＜14, annealed	950 MPa max
	d≥14, annealed	285 HB max
	QT	60 HRC max

Tolerance class to ISO 286-2
mm	h6	h7	h8	h9	h10	h11	h12
＞1 to≤3	0.006	0.010	0.014	0.025	0.040	0.060	0.100
＞3 to≤6	0.008	0.012	0.018	0.03	0.048	0.075	0.120
＞6 to≤10	0.009	0.015	0.022	0.036	0.058	0.090	0.150
＞10 to≤18	0.011	0.018	0.027	0.043	0.070	0.110	0.180
＞18 to≤30	0.013	0.021	0.033	0.052	0.084	0.130	0.210
＞30 to≤50	0.016	0.025	0.039	0.062	0.100	0.160	0.250
＞50 to≤80	0.019	0.030	0.046	0.074	0.120	0.190	0.300
＞80 to≤120	0.022	0.035	0.054	0.087	0.140	0.220	0.350
＞120 to≤180	0.025	0.040	0.063	0.100	0.160	0.250	0.400
＞180 to≤200	0.029	0.046	0.072	0.115	0.185	0.290	0.460
For example a 20mm nominal diameter having a tolerance class h9 is 20mm+0, -0.052mm or 19.948/20. mm