A387-5, SA387-5, Cr-Mo, Pressure Vessel

A387-5, SA387-5, Cr-Mo, Pressure Vessel
STEELMAX Steel Story

A387 은 Chromium-Molybdenum alloy steel plates intented
primarily for welded boilers and pressure vessels

designed for elevated temperature service 입니다.
A387 Grade 5, A387 Gr.5, A387-5 로 표기되기도 하며,

ASME 지정인 경우 SA387-5 (SA387 Gr.5 Cl.2) 로 표기됩니다.
A387 Gr.5는 Class 1, Class 2 로 나뉩니다.

Class 2 는 Austenitic grain size가
coarse grain size (조립화) 입니다.

※ Fine grained steel : 세립강 : 細粒鋼
Steel with an austenitic grain size number is 5 or over.

※ Coarse grained steel : 조립강 : 粗粒鋼
Steel with austenitic grain size number is up to 5.

※ Steels for pressure vessels
Steel products manufactured pressure vessels and high pressure
equipment which require strength, weldability and principally
toughness at a ordinary temperature.

They are generally used for the principal portions of pressure vessels.

※ Steels for boilers
Steel products manufactured for boilers and pressure vessels which
require strength at a high temperature and weldability.

They are generally used for the principal portions of
boilers and pressure vessels.

A387 Supplementary Requirements 약호.

S1 : Vacuum Treatment
S2 : Product Analysis
S3 : Simulated Post-Weld Heat Treatment of Mechanical Test Coupons
S4.1 : Additional Tension Test
S5 : Charpy V-Notch Impact Test
S6 : Drop Weight Test
S7 : High-Temperature Tension Test
S8 : Ultrasonic Examination in accordance with Specification A435/A435M
S9 : Magnetic Particle Examination
S11 : Ultrasonic Examination in accordance with Specification A577/A577M
S12 : Ultrasonic Examination in accordance with Specification A578/A578M
S17 : Vacuum Carbon-Deoxidized Steel

※ 오스테나이트 (Austenite)
감마철로서 한 종류 이상의 원소가 고용된 고용체
Solid solution of one or more elements in gamma iron

※ γ iron (감마철 : gamma iron)
911℃~1392℃ 사이에서 안정된 상태의 순철을 말합니다.
감마의 결정 구조는 면심입방체이며, 상자성체입니다.

Steel Grade	ASTM	ASTM A387 Gr.5	ASTM A387 Gr.11
Steel Grade	UNS No.	S50200	K11789
Chemical Composition (%)	Carbon (C)	0.15 max	0.05~0.17
	Manganese (Mn)	0.30~0.60	0.40~0.65
	Phosphorus (P)	0.025 max	0.025 max
	Sulfur (S)	0.025 max	0.025 max
	Silicon (Si)	0.50 max	0.50~0.80
	Chromium (Cr)	4.00~6.00	1.00~1.50
	Molybdenum (Mo)	0.45~0.65	0.45~0.65
Class 1	Proof Strength (MPa)	205 min	240 min
Class 1	Tensile strength (MPa)	415~585	415~585
Class 2	Proof Strength (MPa)	310 min	310 min
Class 2	Tensile strength (MPa)	515~690	515~690