Stainless Steel Casting
316 is a molybdenum-containing stainless steel. Under high temperature conditions, when the concentration of sulfuric acid is lower than 15% and higher than 85%, 316 stainless steel has a wide range of uses. 316 stainless steel also has good performance against chloride attack.
316L is a stainless steel grade, AISI 316L is the corresponding grade of 316L stainless steel:
American Standard: AISI316L
Japanese standard: SUS316L
German standard: X2CrNiMo1812
My country's unified digital code is S31603, the standard grade is 022Cr17Ni12Mo2 (new standard), and the old grade is 00Cr17Ni14Mo2, which means that it mainly contains Cr, Ni, and Mo, and the number represents the approximate percentage. The national standard is GB/T 20878-2007 (current version). Qinhuangdao Zhongwei Precision Machinery Co., Ltd. specializes in the production of 201, 301, 440, 304, 304l, 316, 316l and other castings, and expects stainless steel casting manufacturers from all over the world to consult and negotiate business.
Product Description
Basic situation of stainless steel casting
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. Available materials:
High manganese steel, high chromium steel, high nickel steel, carbon steel, alloy steel, stainless steel, gray iron, cast iron, cast steel, cast aluminum, etc. are customized according to customer requirements.
Salt Spray Test Of Stainless Steel Castings
●Customer background:
Qinhuangdao Zhongwei Precision Machinery Co., Ltd. is a stainless steel precision casting enterprise specializing in the design, research and development, production and sales of stainless steel products. Precision castings such as mechanical parts and sanitary ware are used in industries and fields such as valves, power stations, railway locomotives, engineering construction, pharmaceuticals, food, and automobiles.
●Facing the problem:
The company produced a batch of stainless steel 316 casting valves, and the customer wanted the workpiece to pass the chemical anti-rust method to achieve a 168-hour neutral salt spray test. According to the samples provided by the customer and the specific environment of storage, Kaimeng technicians put forward 4 sets of different solutions, and implemented the sample processing. After many tests, the second and third solutions can meet the customer's requirements. , and finally, the customer chose the third option and reached a cooperation.
●Technical process:
The main potion is stainless steel passivation solution.
Process flow | Degreasing | Over the water | Passivation | Over the water | Neutralize | Over the water | Drying | Salt Spray |
Potion model | KM0114 | Flowing water | ID3000-1 | Flowing water | Neutralizer | Flowing water | / | / |
Operating temperature | Normal temperature | Normal temperature | Normal temperature | Normal temperature | Normal temperature | Normal temperature | Customize | / |
Operation time | 3 min | 1min | 30min | 1min | 3min | 1min | Customize | 168h |
Qinhuangdao Zhongwei Precision Machinery Co., Ltd. specializes in providing high corrosion resistance, passivation and rust prevention solutions for Stainless steel casting products. It is your reliable stainless steel passivation solution provider!
Chemical composition, mechanical property standards, tensile strength, hardness, carbide content, size requirements.
(Metallographic standard, pearlite content can be tested for reference)
316L stainless steel castings cannot be demagnetized by conventional solid solution. The ferrite content needs to be checked by metallographic examination. The solution treatment time is determined according to the ferrite content. Generally, 5% ferrite content needs solution treatment for 1 hour. An increase of 1% requires an additional 15 minutes or so.
316L stainless steel grades:
American Standard: AISI316L
GB: 00Cr17Ni14Mo2
Japanese standard: SUS316L
German standard: X2CrNiMo1812
Chemical composition content of 316L stainless steel (%):
C ≤0.03 Si≤1.00 Mn≤2.00 P ≤0.035 S ≤0.03
Ni: 12.0-15.0 Cr: 16.0-18.0 Mo: 2.0-3.0
Mechanical properties of 316L stainless steel:
Yield strength (N/mm2) ≥ 480
Tensile strength elongation (%) ≥ 40
Hardness HB≤187 HRB≤90 HV≤200
Density 7.87 g·cm-3
Specific heat c(20℃)0.502 J·(g·C)-1
Thermal conductivity λ/W(m·°C)-1 (at the following temperature/°C)
100 300 500
15.1 18.4 20.9
Resistivity 0.71 Ω·mm2·m-1
Melting point: 1371～1398℃
Corrosion problems of 316L stainless steel:
316 is a molybdenum-containing stainless steel. Under high temperature conditions, when the concentration of sulfuric acid is lower than 15% and higher than 85%, 316 stainless steel has a wide range of uses. 316 stainless steel also has good performance against chloride attack.
316L stainless steel has a maximum carbon content of 0.03 and can be used in applications where annealing after welding cannot be performed and maximum corrosion resistance is required.
(1) Corrosion resistance:
The corrosion resistance is better than 304 stainless steel, and it has good corrosion resistance in the production process of pulp and paper. And 316 stainless steel is also resistant to erosion by marine and aggressive industrial atmospheres.
(2) Heat resistance:
In intermittent use below 1600 degrees and continuous use below 1700 degrees, 316 stainless steel has good oxidation resistance.
In the range of 800-1575 degrees, it is best not to use 316 stainless steel continuously, but when 316 stainless steel is used continuously outside this temperature range, the stainless steel has good heat resistance. The carbide precipitation resistance of 316L stainless steel is better than that of 316 stainless steel, and the above temperature range can be used.
Post Casting Process
1. Heat treatment: annealing, carbonization, tempering, quenching, normalizing, surface tempering
2. Processing equipment: CNC, WEDM, lathe, milling machine, drilling machine, grinder, 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.
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.
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