Investment casting, or lost wax casting, refers to the formation of ceramic around the wax patterns to create a multi or single part mold to receive molten metal. This process utilizes an expendable injection molded wax pattern process to achieve complex forms with exceptional surface qualities. Because the investment castings can achieve exceptional dimension accuracy for both small and large casting parts, the investment casting is also called precision casting.

To create a mold, a wax pattern, or cluster of patterns, is dipped into ceramic material several times to build a thick shell. De-wax process is then followed by the shell dry process. The wax-less ceramic shell is then produced. Molten metal is then poured into the ceramic shell cavities or cluster, and once solid and cooled, the ceramic shell is broken off to reveal the final cast metal object.

Silica sol casting process is the main steel investment casting process of RMC investment casting foundry. We have been developing new technology of adhesive material to achieve much more economical and effective adhesive material for investment casting industry.

It is a overwhelming trend that Silica sol casting process replaces the rough inferior water glass process in whole precision casting industry, especially for stainless steel casting and alloy steel casting. Besides the innovated molding material, the silica sol casting process has also being innovated to much steadier and less heat expanding.

RMC manufactures precision cast metal parts that consistently meet or exceed customer expectations. Lost wax investment casting allows us to produce metal parts as small as tens of grams and as large as tens of kilograms, in a wide range of ferrous and non-ferrous alloys. We could use a wide range of materials for investment casting process. Here in the following are the main alloys we can use for your usage. Of course, we can also cast more metal if you have special need.

Materials for Investment Casting Process at RMC
Category	China Grade	UK Grade	US Grade	Japan Grade	Germany Grade
Carbon Steel	ZG15, ZG20, ZG25, ZG35, ZG45, ZG55, Q235, Q345, Q420	A1, A3, A5, CLA1A, CLA1C, AM1	1008, 1015, 1018, 1020, 1025, 1030, 1035, 1040, 1045, 1050, 1060, 1070, WC6, WCC, WCB, WCA, LCB	SC360, SC450, SC480, SCW410, SCW450, SCW550, SCW620, SCC5, S15C, S20C, S25C, S45C, S50C	1.0570, 1.0558, 1.1191, 1.0619, 1.0446, GS38, GS45, GS52, GS60, 1.0601, C20, C25, C30, C45
Low Alloy Steel	20Mn, 45Mn, ZG20Cr, 40Cr, 20Mn5, 16CrMo4, 42CrMo, 40CrV, 20CrNiMo, GCr15, 9Mn2V	CLA2, CLA3, CLA4, CLA8, CLA5A, CLA5B, CLA9, CLA11, CLA12B, CLA12C, CLA13, CLA1B, EN1A, EN8, EN9, EN14, EN19, EN24, EN32B, PD100A, NCM3, NCM5, NCM8, NCM32	1117, 4130, 4140, 4340, 6150, 5140, WC6, LCB, Gr.13Q, 8620, 8625, 8630, 8640, H13	SCM415, SCM435, SCM440, SCM445, SKS3	GS20Mn5, GS15CrNi6, GS16MnCr5, GS25CrMo4V, GS42CrMo4, S50CrV4, 34CrNiMo6, 50CrMo4, G-X35CrMo17, 1.1131, 1.0037, 1.0122, 1.2162, 1.2542, 1.6511, 1.6523, 1.6580, 1.7131, 1.7132, 1.7218, 1.7225, 1.7227, 1.7228, 1.7231, 1.7321, 1.8519, ST37, ST52
Ferritic Stainless Steel	1Cr17, 022Cr12, 10Cr17,	ANC1B	430, 431, 446, CA-15, CA6N, CA6NM	SCS1, SCS1X, SCS3, CS3X, SCS4, SCS5, SCS6	1.4000, 1.4005, 1.4008, 1.4016, GX22CrNi17, GX4CrNi13-4
Martensitic Stainless Steel	1Cr13, 2Cr13, 3Cr13, 4Cr13,	ANC1C, ANC2	410, 420, 430, 440B, 440C	SCS2, SCS2A	1.4021, 1.4027, 1.4028, 1.4057, 1.4059, 1.4104, 1.4112, 1.4116, 1.4120, 1.4122, 1.4125
Austenitic stainless steel	06Cr19Ni10, 022Cr19Ni10, 06Cr25Ni20, 022Cr17Ni12Mo2, 03Cr18Ni16Mo5	ANC3A, ANC3B, ANC3ALC, ANC3AFC, ANC3BFC, ANC4B, ANC4BFC, ANC20, 316C12, 316S16, 316C16, 347C17	302, 303, 304, 304L, 316, 316L, 329, CF3, CF3M, CF8, CF8M, CN7M, CN3MN	SCS11, SCS13, SCS14, SCS14A, SCS16, SCS16A, SCS18, SCS21, SCS35	1.3960, 1.4301, 1.4305, 1.4306, 1.4308, 1.4313, 1.4321, 1.4401, 1.4403, 1.4404, 1.4405, 1.4406, 1.4408, 1.4409, 1.4435, 1.4436, 1.4539, 1.4550, 1.4552, 1.4581, 1.4582, 1.4584,
Precipitation Hardening SS	05Cr15Ni5Cu4Nb, 05Cr17Ni4Cu4Nb	ANC20, ANC21, ANC22	630, 634, 17-4PH, 15-5PH, CB7Cu-1	SCS24, SCS32	1.4542
High Mn Steel	ZGMn13-1, ZGMn13-3, ZGMn13-5	BW10	B2, B3, B4	SCMnH1, SCMnH11, SCMnH21	1.3802, 1.3966, 1.3301, 1.3302
Duplex Stainless Steel	022Cr22Ni5Mo3N, 022Cr25Ni6Mo2N		A 890 1C, A 890 1A, A 890 3A, A 890 4A, A 890 5A, A 995 1B, A 995 4A, A 995 5A, 2205, 2507	SCS10, SCS11	1.4460, 1.4462, 1.4468, 1.4469, 1.4517, 1.4770
Tool Steel	Cr12		A5, H12, S5	SKD11, SKH9, SKH51	1.2344, 1.3343, 1.4528, GXCrMo17, X210Cr13, GX162CrMoV12
Heat Resistant Steel	20Cr25Ni20, 16Cr23Ni13, 45Cr14Ni14W2Mo	ANC5A	309, 310, CK20, CH20, HK30	SCH1, SCH2, SCH11, SCH13, SCH15, SCH21, SCH22, SCH24, SCH41,	1.4826, 1.4828, 1.4855, 1.4865
Nickle-base Alloy		ANC19	HASTELLY-C, HASTELLY-X, SUPPER22H, CW-2M, CW-6M, CW-12MW, CX-2MW, HX(66Ni-17Cr), MRE-2, NA-22H, NW-22, M30C, M-35-1, INCOLOY600, INCOLOY625	SCH43, SCH44, SCH45,	2.4815, 2.4879, 2.4680
Aluminum Alloy	ZL101, ZL102, ZL104		ASTM A356, ASTM A413, ASTM A360	AC3A, AC4A, AC4C	G-AlSi7Mg, G-Al12
Copper Alloy	H96, H85, H65, HPb63-3, HPb59-1, QSn6.5-0.1, QSn7-0.2	CZ125, CZ102, CZ107, CZ124, CZ122	C21000, C23000, C27000, C34500, C37710, C86500, C87600, C87400, C87800, C52100, C51100	C2100, C2300, C2700, C3560, C3771, C5212, C5111	CuZn5, CuZn15, CuZn35, CuZn36Pb3, CuZn40Pb2, CuSn10P1, CuSn5ZnPb, CuSn5Zn5Pb5
Cobalt-base Alloy			UMC50, 670, Grade 31		2.4778

The lost wax casting process produces near-net-shape precision metal parts that often require little or no additional machining. The resulting finish is also much better than what is achievable through other processes. The strength and durability of the casting parts make themselves ideal for high wear-resistance applications requiring millions of cycles.

Whether we're casting small metal parts in carbon steel or large, intricate shapes in specialty non-ferrous alloys, RMC can deliver precision metal cast parts that perfectly match your designs and usage. We offer design assistance, as needed, to help improve both your part's function and its manufacturability. From the simplest shape to the most complex geometry, we can turn your designs into reality.