A193 B16, SNB16, High Temperature and Pressure

A193 B16, SNB16, High Temperature and Pressure
STEELMAX Steel Story

ASTM A193은 고온 고압용에
적용되는 합금강과 스테인레스 규정입니다.

Standard Specification for Alloy-Steel and Stainless Steel
Bolting for High Temperature or High Pressure Service
and Other Special Purpose Applications.

Steel Grade		SNB16	A193 B16
Chemical Composition(%)	Carbon (C)	0.36~0.44	0.36~0.37
	Silicon (Si)	0.20~0.35	0.15~0.35
	Manganese (Mn)	0.45~0.70	0.45~0.70
	Phosphorus (P)	0.040 max	0.035 max
	Sulfur (S)	0.040 max	0.040 max
	Chromium (Cr)	0.80~1.15	0.80~1.15
	Molybdenum (Mo)	0.50~0.65	0.50~0.65
	Vanadium (V)	0.25~0.35	0.25~0.35
	Aluminum (Al)	0.015 max	–
Yield Strength(N/㎟)	16≤D	725min	105 ksi
	16＜D≤100	655 min	95 ksi
	100＜D≤120	590 min	85 ksi
Tensile Strength(N/㎟)	16≤D	860 man	125 ksi
	16＜D≤100	760 min	110 ksi
	100＜D≤120	690 min	100 ksi
1 ksi = 6.9 MPa (N/㎟)

Class	Symbol	Diameter	Reference
Class1	SNB5	D100 max	AISI501, ASTM A193 B5
Class2	SNB7	D120 max	AISI4140, 4142, 4145, ASTM A193 B7
Class3	SNB16	D180 max	ASTM A193 B16

Class	Symbol	Tempering temperature ℃
Class1	SNB5	595 min
Class2	SNB7	595 min
Class3	SNB16	650 min

A193 B16 은, 실 공급에서는 QT 열처리재로 공급되는 경우가
많으며, 탄소량으로만 보면 기계 구조용 탄소강 S40C 수준의

높은 Carbon 함량을 지니며
열에 견뎌야 하는 강재답게 , 내열강 원소인

Molybdenum 을 0.50 % 이상 함유하며
공구강 필수 원소인 Vanadium 도 가집니다.–몽키 스패너도 Vanadium을 함유함.

Bolting materials herein means steel bar, wire rods, not subjected
to the screw cutting process, stud bolts so on.
Bolting materials shall be manufactured from killed steel.

※ Killed Steel (킬드강, 탈산강)
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 일산화 탄소를 발생 시키지 않고,
조용히 응고해, 비교적 균질하고, 편석이 적고, 기포도 없지만
응고된 강괴 윗부분 중심으로부터, 수축공이 생겨, 회수율이
좋지 못한 단점이 있고, 결정입도, 탈산제에 따라 세부적으로 더 분류됩니다.