The Pessimist is personified by my husband. Whenever he gets the smallest bit of bad news

The Pessimist is personified by my husband. Whenever he gets the smallest bit of bad news

What we can achieve by sand casting

Step of sand casting Process

1. Making pattern

Patterns made of goods, resin(plastics) or Aluminum can be used to produce during casting.  But the Aluminum costs will be the highest and will be the most suitable process if you need thousands of castings with high dimensional tolerances and better surface quality.

2. Molding process

The resin sand will be mixed by the sand treatment equipment, then shoot into the sand boxes. The molding workers will guarantee the sand can be filled to all positions, then make the sand as solid as possible.

3. Self-hardening

After molding by workers, sand is still loose, then sand mold will be coated by a type of alcoholds based coating,  after burning, the resin sand mold will become solid. This is why casting process is called as hard hold casting process.

4. Melting and pouring

Just like sand casting process, medium frequency electrical furnaces are used to melt iron for sanding casting process.

5. Sand blasting, cleaning and grinding

The shot blasting process is to remove the sand, oxides… then workers will cut of the gating systems, grind the gating and parting lines. Finally, the rough castings will be completed.

If the 2^nd processes like machining are needed, these complete castings will be taken to the next steps.

The key business areas of EHT TRADING AND PRODUCTION LIMITED COMPANY (EHT) are the customized manufacturing,

Sand casting foundry

Sand casting process uses the green sand or dry sand to make the molds for casting molten metals. Most of castings are produced by this old but new casting process. Sand casting is one of the most popular and simplest types of casting. Sand casting allows for smaller batches than permanent mold casting and at a very reasonable cost.

Due to its well-suited for complex geometries, sand casting process takes advantage of compact sand, refractory and recyclability to produce relatively less expensive molds with quick tooling development and design changes at a competitive cost. For some desired castings of huge size and weight, the sand casting process is the first choice we should think when we choose the suitable manufacturing methods.

In our high-tech facilities, we offer both automatic machine and manual molding operations in our resin sand casting processes. We can pour gray and ductile iron castings using our no-bake process up to 1 ton finished weight in gray iron castings and ductile iron castings, and up to 0.5 tons in steel castings.

• Gray Cast Iron: HT150, HT200, HT250, HT300, HT350; EN-GJL-100, EN-GJL-150, EN-GJL-200, EN-GJL-250, EN-GJL-300, EN-GJL-350; GG10, GG15, GG20, GG25, GG30,GG35, GG40.
• Ductile Cast Iron (Nodular Cast Iron): GGG40, GGG45, GGG50, GGG60, GGG70, GGG80; EN-GJS-400-18, EN-GJS-40-15, EN-GJS-450-10, EN-GJS-500-7, EN-GJS-600-3, EN-GJS-700-2, EN-GJS-800-2; QT400-18, QT450-10, QT500-7, QT600-3, QT700-2, QT800-2;
• White iron, compacted graphite iron and malleable iron.
• Malleable Cast Iron
• Carbon Steel, Alloy Steel
• Aluminiumand Its Alloys
• Brass and Copper-based Alloys
• Stainless Steel / Duplex Stainless Steel
• Other Alloys as request or according to ASTM, SAE, AISI, GOST, DIN, EN, ISO, and GB.

Custom Sand Castings we are casting

EHT Company cooperate together with my local foundries in Hai Phong city which have high abilities doing steel casting and offering the investment casting (lost wax casting) possibilities with best quality casting parts for competitive prices to to produce various steel castings parts for our clients. These are widely appreciated by our clients for their strength, durability and corrosion resistance. We can provide these in customized sizes and specifications in accordance with the requirements of our esteemed clients.

The materials include low mild carbon steel, medium carbon steel, high carbon steel, low alloy, alloy steels. Production as standards AS2074, ASTM A148, A128, A128M, A297, KS D4101, AISI 410, 416..

Structural Characteristics of Alloy Steel Castings

The minimum wall thickness of steel castings should be greater than the minimum wall thickness of gray cast iron. It is not suitable to design too complex castings

* Steel castings have relatively large internal stress and are easy to bend and deform

* The structure should minimize hot nodes and conditions for sequential solidification should be created

* The fillet of the connecting wall and the transition section of different thickness are larger than those of cast iron

* Complicated castings can be designed into a casting + welding structure to facilitate casting production

Please contact us for more details: This email address is being protected from spambots. You need JavaScript enabled to view it. 

We will feedback to you within a business day.

Below are carbon Structural Steel Grades:

GB	ASTM	BS	JIS	NF	DIN
08F	1006	040A04	S09CK		C10
08	1008	045M10	S9CK		C10
10F	1010	040A10		XC10
10	1010,1012	045M10	S10C	XC10	C10,CK10
15	1015	095M15	S15C	XC12	C15,CK15
20	1020	050A20	S20C	XC18	C22,CK22
25	1025		S25C		CK25
30	1030	060A30	S30C	XC32
35	1035	060A35	S35C	XC38TS	C35,CK35
40	1040	080A40	S40C	XC38H1
45	1045	080M46	S45C	XC45	C45,CK45
50	1050	060A52	S50C	XC48TS	CK53
55	1055	070M55	S55C	XC55
60	1060	080A62	S58C	XC55	C60,CK60
15Mn	1016,1115	080A17	SB46	XC12	14Mn4
20Mn	1021,1022	080A20		XC18
30Mn	1030,1033	080A32	S30C	XC32
40Mn	1036,1040	080A40	S40C	40M5	40Mn4
45Mn	1043,1045	080A47	S45C
50Mn	1050,1052	030A52	S53C	XC48

Carbon cast steel

Carbon steel is an alloy containing two main components: iron (Fe) and carbon (C), in addition, carbon steel also contains other auxiliary substances such as Manganese (maximum 1.65%), Silicon (max. 0.6%) and Bronze (maximum 0.6%).

Carbon content in steel is inversely proportional to ductility and directly proportional to its hardness and strength. That means the higher the carbon content, the harder the steel to bend.  The lower the carbon content, the more flexible and durable the steel is. At the same time, the carbon content in steel increases also leads to a decrease in the melting point of the steel.

Carbon steel classifies into 3 main types that are low carbon steel, medium carbon steel and high carbon steel.

Type of carbon steel	Carbon content	Manganese	Silicon	Phosphorus	Sulfur	Tensile strength(MPa)
Low carbon steel	< 0.20%	0.50 to 0.85%	0.25 to 0.70%	max 0.05%	max 0.06%	276 to 483
Medium carbon steel	0.20 to 0.50%	0.50 to 1.00%	0.20 to 0.80%	max 0.05 %	max 0.06 %	448 to 724
High carbon steel	>0.50%	0.50 to 1.00%	0.20 to 0.70%	max 0.05%	max 0.05%	655 to 125

Alloy steel

Alloy steel is type of steel that in addition to carbon, it contains alloying elements in a certain proportion. Common alloy elements can name Cr, Ni, Mn, Si, W, V, Co, Mo, Ti, Cu, etc. They are intentionally added in a certain amount (1.0% and 50%) to change the structure and properties of steel. Depend on different elements and percentage of these elements in steel, a various steel alloy classes are created.

Classification according to amount of alloy element in steel, it includes two main types:

        – Low alloy steel: the total amount of alloying elements is less than 8%.

        – High alloy steel: the total amount of alloying elements is more than > 8%.

Both of these two alloy steel has more excellent mechanical properties in comparing to carbon steel.

Additionally, by adjusting the alloy element to steel, we can collect the desire properties. The below table shows off the effect of adding element to steel in a certain proportion.

Element	Wt.%	Function
Chromium	0.5–2.0	Increase hardenability
Chromium	4–18	Increase corrosion resistance
Copper	0.1–0.4	Increase corrosion resistance
Lead	-	Improves machinability
Manganese	>1	Increase hardenability
Nickel	2–5	Increases toughness
Silicon	0.2–0.7	Increases strength and hardenability

Our steel casting process

EHT invests and develops in sand casting steel and lost foam casting lines that allow to cast most of carbon steel and low steel alloy products.

At our steel foundry, there are 6 sand casting lines including 5 green sand casting area and 1 furan resin casting line. Additional, we also have 1 lost foam casting line to process high precise and smooth casting requests.

Besides, we also invest CNC machines for turning, lathe, drilling casting steel parts serving various customer demands.

How to place a steel casting order with EHT?

As an OEM custom casting steel manufacturer and supplier, we can work on different casting requirements in almost all industries.

If you are looking for a reliable steel casting foundry, kindly contact us to open a discussion. Our technical expert will consider your drawing and requirement to offer the best casting solution as well as most competitive price.