MIL-S-7393, 9310 VAR, Case Hardening NT Round-Bar

MIL-S-7393, 9310 VAR, Case Hardening NT Round-Bar
STEELMAX Steel Story

MIL-S-7393 규정은 항공기강 규정으로 (aircraft quality)
SAE/AISI UNS G93106, ASTM A837 Grade 9310 과 대응됩니다.

MIL-S-7393, 9310 재질은 합금강으로, Nickel-Chromium 합금으로 침탄 처리
가능한 표면 경화용 강재이고, 높은 심부 강도와 인성 (toughness) 재료입니다.

MIL-S-7393, 9310 합금강재는 Annealed or Normalized and Tempered 조건이며
열간 압연 강재 또는 Cold Drawn or Cold Ground (CG) 냉간 마무리 조건입니다.

MIL-S-7393, 9310 재질을 NT 했을 경우, 기계적 성질인 Typical
인장강도는 906 MPa, 항복강도 570 MPa, 경도 HB 269 수준입니다.

또한 한쪽 끝 경화능 강재로 열처리 하는 경우, ASTM A304 중복 Spec
적용 가능한 강재로 봉재 끝단은 HRC 43~31 수준입니다.

※ Aircraft Quality Steel (AQ Steel : 항공기강 : 航空機鋼)
AQ Steel is the most commonly specified quality for general aerospace applications.
It is defined in SAE specification AMS 2301, which outlines the procedure for determining
compliance with cleanliness requirements by the magnetic particle inspection method.

※ Carburizing (침탄)
Thermochemical treatment which is applied to a ferrous product
in the austenitic state, to obtain a surface enrichment in carbon,
which is in solid solution in the austenite
Further, carburized steel is generally used after it is quenched
and tempered. This treatment is sometimes called case hardening
This is classified into solid carburizing, liquid carburizing and
gas carburizing according to the type of carburizing agents
The carburized ferrous product undergoes quench hardening
(immediately or later)
The medium in which carbonitriding takes palace
should be specified, e.g. gas, salt, bath. etc.

오스테나이트 상태의 철강재에서 표면에만 오스테나이트중의
고용 탄소 농도를 높이고자 시행하는 열 화학적 처리로
침탄에 이용된 가스나 고체 등의 매질은 반드시 표기해야 한다.

※ Vacuum melting (진공 용해)
Melting in a vacuum to prevent contamination from air, as well as to
remove gases already dissolved in the metal ; the solidification may
also be carried out on a vacuum or at low pressure.

ASTM A837-9310, UNS G93106
Chemical composition(%)	Carbon (C)	0.07~0.13
	Manganese (Mn)	0.40~0.70
	Phosphorus (P)	0.035 max
	Sulfur (S)	0.040 max
	Silicon (Si)	0.15~0.35
	Nickel (Ni)	2.95~3.55
	Chromium (Cr)	1.00~1.45
	Molybdenum (Mo)	0.08~0.15
	Copper (Cu)	0.35 max