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Email: hhcasting@126.com

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Metal Castings

Best Selling trendy Brass Metal Casting bronze metal casting Grand Wholesales Metal Pins back button Badge

FAQ: Q 1.Why should we send inquiry to you? We are professional one-stop customized mechnical parts and service provider.We have the word-class foundry equipment and technology processing.We had 5 years of castings experience in exporting. We can bespoke manufacture of drawing,samples...


Material

Brass, Stainless Steel, Steel, Ductile Iron, Grey Iron, Aluminum, Bronze, Copper, and customized material from clients.

Material Grade

ASTM, DIN, GB, BS, JIS, AISI, NF, etc

Process

Investment casting, Sand Casting,

Weight

0.01kg- 150kg

Tolerance

CT 4-9 grade, and based on the custom drawings

Drawing (files) format

Igs, Stp, X-T PDF, Jepg, Jpg

Capabilities of Production

Aluminum: More than 80 Mt per month.


Stainless Steel: More than 200 Mt per month.

Surface Treatment

Anodize/Zinc Plating/ Nickel Plating, Tinting/ Polishing/Blacking, etc

MOQ

Depends on the items, please contact us for free

Heat Treatment

Quenching, Normalizing, Annealing, Plating,Carburizing

Applications

Automotive, Agricultural Machines, vessels, Tooling, Mining, Oil & gas industry, Locomotive industry, Aerospace, Hardware, Construction, Engineering Machine, Electrical Equipment, etc

Machining Equipment

Threading, Turning, Milling, Grinding, CNC/NC, Boring, Test facilities

Measuring Tools

Gauge, Thread gauge, Height Gauge, Vernier caliper, Depth caliper, Micrometer, CMM, etc

QC System

Fully inspection before Delivery

Available Service

OEM & ISO

Payment Terms

L/C, D/A, D/A,T/T, PayPal

Shipment Terms

FOB, CIF

Samples

Few Samples are acceptable

Certification

IS9001:2008.

Tooling leadtime

10-15 working days

Production leadtime

15 working days, based on the quantity of demand

FAQ:

Q 1.Why should we send inquiry to you?
We are professional one-stop customized mechnical parts and service provider.We have the word-class foundry equipment and technology processing.We had 5 years of castings experience in exporting.
We can bespoke manufacture of drawing,samples mapping,raw material processing and design manufacture according to your originality.
Q 2.How long can we get the price list?
We are factory direct best price.So our price list will be quoted within 24 hours after we get your inquiry with detailed informations (such as drawings, material,technology specification,surface treatment,quantity, special requirements and etc)
Q 3.How about quality of your castings parts?
After you confirmed the quotation for pattern cost,raw casting cost,machining cost and coating cost.We will send to you the sample for you inspection approval.
Q 4.How about your after market service?
We could confidential of the quality of delivered parts and compensate 100% on defective parts.
Q 5.What`s your Minimun Order Quantity(MOQ)
According to your requirement that only one piece can customized for you.

Copper and Copper Alloys Casting Problems

Group II alloys

Group II alloys are those that have an intermediate freezing range, that is, a freezing range of 50 to 110oC between the liquidus and the solidus. Group II alloys are: beryllium copper (C81400, C82000, C82200, C82400, C82500, C82600, C82800), silicon brass (C87500), silicon bronze (C87300, C87600, C87610, C87800), copper-nickel (C96200, C96400).

Beryllium Coppers. These alloys are very toxic and dangerous if beryllium fumes are not captured and exhausted by proper ventilating equipment. They should be melted quickly under a slightly oxidizing atmosphere to minimize beryllium losses. They can be melted and poured successfully at relatively low temperatures. They are very fluid and pour well.

Silicon Bronzes and Brasses. The alloys known as silicon bronzes, UNS alloys C87300, C87600, and 87610, are relatively easy to melt and should be poured at the proper pouring temperatures. If overheated, they can pick up hydrogen. While degassing is seldom required, if necessary, one of the proprietary degasifiers used with aluminum bronze can be successfully used. Normally no cover fluxes are used here. The silicon brasses (UNS alloys C87500 and C87800) have excellent fluidity and can be poured slightly above their freezing range. Nothing is gained by excessive heating, and in some cases, heats can be gassed if this occurs. Here again, no cover fluxes are required.

Copper-Nickel Alloys. These alloys (90Cu-10Ni, UNS C96200 and 70Cu-30Ni, UNS C96400) must be melted carefully because the presence of nickel in high percentages raises not only the melting point but also the susceptibility to hydrogen pickup. In virtually all foundries, these alloys are melted in coreless electric induction furnaces, because the melting rate is much faster than it is with a fuel-fired furnace. When ingot is melted in this manner, the metal should be quickly heated to a temperature slightly above the pouring temperature and deoxidized either by the use of one of the proprietary degasifiers used with nickel bronzes or, better yet, by plunging 0.1% Mg stick to the bottom of the ladle. The purpose of this is to remove all the oxygen to prevent any possibility of steam-reaction porosity from occurring. Normally there is little need to use cover fluxes if the gates and risers are cleaned by shot blasting prior to melting.

Group III alloys

Group III alloys have a wide freezing range. These alloys have a freezing range of well over 110oC, even up to 170oC. Group III alloys are: leaded red brass (C83450, C83600, C83800), leaded semi-red brasses (C8400, C84800), tin bronze (C90300, C90500, C90700, C91100, C91300), leaded tin bronze (C92200, C92300, C92600, C92700), high-leaded tin bronze (C92900, C93200, C93400, C93500, C93700, C93800, C94300).

These alloys, namely leaded red and semi-red brasses, tin and leaded tin bronzes, and high-leaded tin bronzes, are treated the same in regard to melting and fluxing and thus can be discussed together. Because of the long freezing ranges involved, it has been found that chilling, or the creation of a steep thermal gradient, is far better than using only feeders or risers. Chills and risers should be used in conjunction with each other for these alloys. For this reason, the best pouring temperature is the lowest one that will pour the molds without having misruns or cold shuts. In a well-operated foundry, each pattern should have a pouring temperature, which is maintained by use of an immersion pyrometer.

Fluxing. In regard to fluxing, these alloys should be melted from charges comprised of ingot and clean, sand free gates and risers. The melting should be done quickly in a slightly oxidizing atmosphere. When handled at the proper furnace temperature and cooled to the proper pouring temperature, the crucible is removed or the metal is tapped into a ladle. At this point, a deoxidizer (15% phosphor copper) is added. The phosphorus is a reducing agent (deoxidizer). This product must be carefully measured so that enough oxygen is removed, yet a small amount remains to improve fluidity. This residual level of phosphorus must be closely controlled by chemical analysis to a range between 0.010 and 0.020% P. If more is present, internal porosity may occur and cause leakage if castings are machined and pressure tested.

In addition to phosphor copper, pure zinc should be added at the point at which skimming and temperature testing take place prior to pouring. This replaces the zinc lost by vaporization during melting and superheating. With these alloys, cover fluxes are seldom used. In some foundries in which combustion cannot be properly controlled, oxidizing fluxes are added during melting, followed by final deoxidation by phosphor copper.


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