SUP 9A, SPS 9A, Spring Steel, Mn-Cr, Killed steel

SUP 9A, SPS 9A, Spring Steel, Mn-Cr, Killed steel
STEELMAX Steel Story

JIS G4801 Spring steels,
KS D3701 Spring steels에 규정된 강재입니다.

KS, JIS 내용은 같습니다.
열간 성형 스프링 강재에 대한 규정이며

겹판 스프링 (laminated spring), 코일스프링 (coiled spring)
비틀림 막대 스프링 (torsion spring) 으로 사용됩니다.

단련 성형비 4S 이상으로 제조해야 하며 (특별한 지정이 없으면)
Killed steel로 제조 되며 사용상 해로운 탈탄이 없어야 합니다.

JIS Symbol	SUP9	SUP9A	SUP10
KS Symbol	SPS9	SPS9A	SPS10
Carbon (C)	0.52~0.60	0.56~0.64	0.47~0.55
Silicon (Si)	0.15~0.35	0.15~0.35	0.15~0.35
Manganese (Mn)	0.65~0.95	0.70~1.00	0.65~0.95
Phosphorus (P)	0.030 max	0.030 max	0.030 max
Sulfur (S)	0.030 max	0.030 max	0.030 max
Copper (Cu)	0.30 max	0.30 max	0.30 max
Chromium (Cr)	0.65~0.95	0.70~1.00	0.80~1.10
Vanadium (V)	–	–	0.15~0.25

SUP 9A	13t	14t	15t	16t	17t	18t	19t	20t	21t
60w	○	○	○
70w	○	○	○	○				○
80w	○	○	○	○		○
90w	○	○	○	○	○		○	○	○
100w	○	○		○		○		○

※ Forging ratio
The degree of the size of deformation by the operation of forging.
It is generally presented by appending the symbol of operation
type to the ratio of the cross-sectional area before forging
to the sectional area after finishing forging.

단조 (단련) 작업에 따른 변형 크기의 정도를 말하며
일반적으로는 단조 전의 단면적과 단조 후의 단면적을
비율을 말합니다.

※ Decarburization (탈탄)
Removal of carbon from the outer surface of iron or steel,
usually by heating in an oxidizing or reducing atmosphere.
Water vapor, oxygen and carbon dioxide are strong decarburizers.
Reheating with adhering scale is also strongly decarburizing in action.

※ Killed Steel
Steel sufficiently deoxidized with ferrosilicon, aluminium, and so on.
In the case of ingot casting, during the progress of solidification in a ingot mold,
it is gently solidified without generation of carbon monoxide,
being comparatively uniform, with little segregation and has no blow hole.
however, because of a shrinkage cavity is formed in the centre of upper part,
its yield is low, In the case of continuous casting, it is killed steel and,
comparing with an ingot casting, uniformity and yield better.
killed steel is further classified according to grain size or deoxidizer.

페로실리콘이나, 알루미늄 등으로 충분히 탈산한 강철로,
용탕이 응고 진행 중에 일산화탄소를 발생 시키지 않고,
조용히 응고해, 비교적 균질 하고, 편석이 적고, 기포도 없지만
응고된 강괴 윗부분 중심으로부터, 수축공이 생겨, 회수율이
좋지 못한 단점이 있고, 결정 입도, 탈산제에 따라 세부적으로 더 분류됩니다.