Gilding Metal Clad Steel (gmcs) Brass Steel Bullet Envelope Materials/Bimetallic Sheet Composite

Product Description

The military gilding metal clad steel strip is made of high quality special steel as the base material and H90(C22000) brass as the composite material. The technology of warm pressing and high processing rate (forming complete mechanical meshing between brass and steel) and high temperature heat treatment infiltration process (mutual infiltration between Cu and Fe molecules) are adopted. Therefore, there is a metallurgical bonding layer composed of mutually permeable copper and iron between two metals, so that copper and steel can be permanently bonded without splitting, and can be processed as a single metal. The military gilding metal clad steel strip combines the characteristics of two metals. It has the advantages of corrosion resistance, lubrication, wear resistance and beauty of H90(C22000)brass metal. It also has high strength and good ductility of special steel. The good comprehensive performance of gilding metal clad steel manufactured by warm pressing infiltration composite production method is unmatched by manufactured by traditional composite method. In addition to having the common characteristics of high strength, good heat resistance, thermal stability, plasticity, corrosion resistance and wear resistance of composite materials, compared with the traditional composite process, produced by warm pressing infiltration process has the following advantages:
A: High dimensional accuracy, which is conducive to improving the quality of bullets;
B: The composite has good consistency, so as to ensure the consistency of warhead and cartridge case;
C: One batch has large weight and can be processed continuously, which greatly improves the production efficiency of bullets;
D: It has excellent surface quality, and comparable to pure copper.
i)Military Products

Standard size	Brass-steel-brass	Brass-steel-brass	Brass-steel-brass
Strip width	78/87/91/114/135139.5mm	124/135/137/140/155mm	< 600 mm
Strip thickness	1.7-3.6mm	0.5-1.37mm	0.05-4.0 mm
Coating thickness	3.4%-4%	3.4%-4%	3%-15 %
Base material	F18 steel	F11 steel	SPHC steel
Cladding material	H90 copper	H90 copper	H90 copper
Delivery form	Coil / Plate	Coil / Plate	Coil / Plate

ii)Chemical Composition

Grade	Chemical composition of steel strip
	C	Si	Mn	P	S	Ni	Cr	Cu	Als
	%	%	%	%	%	%	%	%	%
F11	≤0.11	≤0.06	0.30-0.55	≤0.02	≤0.01	≤0.3	≤0.15	≤0.2	0.02-0.1
F18	0.11-0.19	≤0.06	0.35-0.55	≤0.02	≤0.01	≤0.3	≤0.15	≤0.2	0.02-0.1
SPHC	≤0.15	≤0.05	≤0.6	≤0.035	≤0.035	-	-	-	≥0.010

Grade	Chemical composition of copper strip
	Cu+Ag (min)	P	Bi	Sb	As	Fe	Pb	S	Zn	Total impurities
	%	%	%	%	%	%	%	%	%	%
H90	88-91	-	-	-	-	≤0.1	≤0.02	-	allowance	≤0.2

iii)Mechanical properties and metallographic structure

material	tensile strength(Mpa)		Elongation(%)		Grain size	Pearlite	Non-metallic inclusions A/B/C/D
	Annealed	half hard	Annealed	half hard
H90/SPHC/H90	290~355	360~455	≥36%	≥8%	7-10	1-5	≤2.5
H90/F11/H90	265~365	-	≥43%	-	7-10	1-5	≤2.5
H90/F18/H90	305~395	-	≥37%	-	7-10	2-6	≤2.5

iv)Equipment Introduction
2000tons Compound rolling mill
20-High finishing mill
Bell type annealing furnace
950 Finishing mill

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