Carbon Steel Sand Casting

Carbon cast steel is a kind of steel material, and carbon is the main element that affects the mechanical properties of carbon cast steel. With the increase of carbon content, both the yield point and tensile strength of Carbon steel sand casting increased, and the tensile strength increased more than the yield point. In addition, as the carbon content increases, the ductility and toughness of carbon cast steel decrease. When the carbon content in carbon cast steel exceeds 0.45%, the yield point rises very little, while the ductility and toughness decrease significantly. As the carbon content increases, the solidification temperature of carbon cast steel decreases, and the fluidity and casting properties of molten steel become better.

Product Description

● Annual remaining processing capacity: 10,000,000 (pieces)

● Casting process: sand casting and precision casting

● Material: according to customer requirements

● Proofing cycle: 4-7 days

● Annual maximum processing capacity: 100,000,000 (pieces)

● Production range: a few grams to several hundred kilograms

● Casting types: clay wet sand casting, lost wax casting, etc.

● Molding process: gravity casting, low pressure casting, mold casting, etc.

● Tolerance: 0.1-1mm

● Processing cycle: 4-30 days

Product Basics

1. Implementation standards: The company strictly implements ISO9001 & TS 16949 certification.

2. Product material standards: ISO, GB, ASTM, SAE, ISO, EN, DIN, JIS, BS

3. Main processes: sand casting, silica sol investment casting, water glass investment casting,shell casting,deburring, sand blasting, machining, heat treatment, leak testing, surface treatment, etc.

4. Some of the available materials:

Production Process

aking the lost foam as an example: when the lost foam produces low carbon steel castings, after the analysis and summary of various reasons that may cause the carbon content to exceed the standard, the design of the production process technical parameters for the lost foam production of low carbon steel castings is modified. Adjust to create a reasonable and reliable low carbon steel casting process technical condition setting system production operation mode, so as to ensure the technical requirements of using lost foam to produce qualified low carbon steel casting products. When adjusting the technical parameter settings of the production operation control process of the lost foam production of low Carbon steel sand casting, special attention should be paid to the following points:

1.Add a flame retardant to the pattern to prevent the pattern from cracking and burning at high temperature, so that it does not produce or less carbon-containing solid products. Such as adding flame retardants 0.5% to 3% chlorinated paraffin, triphosphate, pentabromodiphenyl ether, antimony trioxide, etc. At the same time, 0.2% to 0.5% of dibenzoyl peroxide, dilauroyl peroxide, etc. are added to accelerate the transformation of the flame retardant-containing pattern into gas, thereby reducing the carburizing conditions and conditions during the casting process.

2. During the brushing process of the pattern coating layer, anti-carburization materials can be added. Some anti-carburization catalysts, such as alkali metal salts and limestone powder, are added during the preparation of the pattern coating, so that the pattern can decompose a sufficient amount of CO and CO2 gas in the coating layer after pouring to absorb carbon, thereby preventing the casting from seeping. Carbon; or adding oxidant to the coating to promote the transformation of C and H2 gas after thermal decomposition of the pattern into neutral gas, so that the thermally decomposed C and H less penetrate into the casting, resulting in the occurrence of carburization or hydrogen embrittlement.

3. Strictly control the quality of the reuse of molding sand. To ensure that the production and use of the molding sand meets the requirements of the process technical parameters, especially the dust content in the molding sand must be strictly controlled to prevent the air permeability of the casting sand box from being reduced due to dust, resulting in the thermal decomposition products of the casting pattern being unable to be discharged in time. Increase the carbonization rate of castings.

4. When casting low carbon steel castings, it is necessary to improve the vacuum degree of the casting sand box. The molding sand box should adopt the structure of vacuuming the box wall. During pouring, the vacuuming of the box wall can accelerate the escape of thermal decomposition products to the outside of the cavity, thereby reducing the concentration and contact time of thermal decomposition products of the pattern, reducing or avoiding cast steel. Carburizing and carbon deposition of parts. When the sand size is 20 meshes to 40 meshes, it is advisable to use 0.03MPa to 0.06MPa when casting steel castings. If the negative pressure is too large, it will cause the occurrence of casting sand sticking and other defects.

5. For the pouring of low carbon steel castings, the bottom pouring method should be used as much as possible to make the filling flow of the pouring molten steel smooth, and the thermal decomposition products of the pattern can smoothly enter the slag collecting cavity or riser, thereby reducing and reducing the pattern. The contact reaction time of the liquid and solid phases in the thermal decomposition product reduces and eliminates the probability of carbon increase. The use of rain pouring system to pour low carbon steel castings will increase the working conditions and conditions of carburization, carburization and carbon deposition of the castings, resulting in serious defects and unsuitable use of the castings.

Post Casting Process

1. Heat treatment: annealing, carbonization, tempering, quenching, normalizing, surface tempering

2. Carbon steel sand casting processing equipment: CNC, wire cutting, lathe, milling machine, drilling machine, grinding machine, etc.;

3. Surface treatment: powder spraying, chrome plating, painting, sandblasting, nickel plating, galvanizing, blackening, polishing, bluing, etc.

Moulds and Inspection Fixtures

1. Mold service life: usually semi-permanent. (except for lost foam)

2. Mold delivery time: 10-25 days, (according to product structure and product size).

3. Tooling and mold maintenance: Zhongwei is responsible for precision parts.

Available Materials List:

Grey iron and ductile iron

Other materials: cast iron, cast steel, cast aluminum, cast copper, alloy steel, etc. can be customized according to customer requirements.

Quality Control

1. Quality control: the defective rate is less than 0.1%.

2. Samples and trial run will be 100% inspected during production and before shipment, sample inspection for mass production according to ISDO standards or customer requirements.

3. Testing equipment: flaw detection, spectrum analyzer, golden image analyzer, three-coordinate measuring machine, hardness testing equipment, tensile testing machine;

4. Provide after-sales service.

5. The quality can be traced back.

Application

At present, the proportion of carbon steel output in the total steel output of various countries remains about 80%. It is not only widely used in construction, bridges, railways, vehicles, ships and various machinery manufacturing industries, but also in the modern petrochemical industry. , marine development, etc., have also been widely used.

Carbon Steel - Basic Introduction

Steel with a carbon content of less than 1.35% and no other alloying elements except iron, carbon and impurities such as silicon, manganese, phosphorus, and sulfur within the limit. The properties of carbon steel mainly depend on the carbon content. When the carbon content increases, the strength and hardness of the steel increase, and the plasticity, toughness and weldability decrease. Compared with other steels, carbon steel is the earliest used, with low cost, wide performance range and the largest amount.

Carbon Steel - Basic Use

1. Q195 is used to manufacture smaller parts, iron wires, iron rings, shims, split pins, tie rods, stamping parts and welding parts, etc.

2. Q215 A is used in the manufacture of tie rods, ferrules, gaskets, infiltrated rings, carburized parts and welded parts.

3. Q235 A A and B grades are used to manufacture metal structural parts, carburized parts or carbonitriding parts with low core strength requirements, tie rods, connecting rods, hooks, couplers, bolts, nuts, sleeves, shafts and Connectors; C and D grades are used to manufacture important welded structural parts.

4. Q255 A is used to manufacture parts with low strength requirements such as shafts, mandrels, hooks, tie rods, rockers, wedges, etc. The negative weldability is acceptable.

5. Q275 is used to manufacture shafts, sprockets, gears, hooks and other parts with high strength requirements.

Carbon Steel - Classification

1. Low carbon steel: also known as mild steel, carbon content from 0.10% to 0.25% low carbon steel is easy to accept various processing such as forging, welding and cutting, commonly used in the manufacture of chains, rivets, bolts, shafts, etc.

2. Medium carbon steel: carbon steel with a carbon content of 0.25% to 0.60%. There are killed steel, semi-killed steel, boiling steel and other products. In addition to carbon, it can also contain a small amount of manganese (0.70% to 1.20%). The strength and hardness are higher than those of low carbon steel, while the plasticity and toughness are lower than those of low carbon steel. Hot-rolled and cold-drawn materials can be used directly without heat treatment, or they can be used after heat treatment.

3. High carbon steel: often called tool steel, with carbon content ranging from 0.60% to 1.70%, which can be hardened and tempered. Hammers, crowbars, etc. are made of steel with a carbon content of 0.75%; cutting tools such as drills, taps, reamers, etc. are made of steel with a carbon content of 0.90% to 1.00%.