High Silicon Cast Iron (HSCI) is a special iron for Corrosion Resistant application, which contains up 14% – 18% silicon. This typical cast iron is aimed for acid environment exploitation. Widely used for centrifugal pumps, equipment for sulphuric acids such as blades and mixer, pipe fittings, tubular anode kit
ASTM A518/A518M-99(2018) Standard Specification for Corrosion-Resistant High-Silicon Iron Castings
ASTM A861 is a high silicon cast iron application: ASTM A861 – 04(2017) Standard Specification for High-Silicon Iron Pipe and Fittings
There are three grades in ASTM A518 standard: Grade 1, Grade 2, and Grade 3.
ASTM A518/518M Grade 2 High Silicon Cast Iron Chemical requirements
| Standard | ASTM A518 |
| Grade | Grade 2 |
| C | 0.75-1.15 |
| Si max | 14.20-14.75 |
| Mn max | 1.50 max |
| P max | – |
| S max | – |
| Cr | 3.25-5.00 |
| Mo | 0.40-0.60 |
| Cu | 0.50 max |
High Silicon Cast Iron Heat treatment process:
High-silicon iron castings are generally used in the heat-treated (stress-relieved) condition. Small castings of simple configuration not conducive to high-residual stresses may be used in the as-cast condition. If the castings are to be supplied in the stress-relieved condition, the purchaser must so specify.
At its option, the foundry may heat treat the castings to remove stresses without the purchaser so specifying.
If used, the stress-relieving heat treatment shall be as follows:
- Heat at a rate that will not crack the castings.
- Hold the castings at a minimum temperature of 1600°F [870°C] for a minimum period of 1 h/in. [mm] of maximum section thickness, except that in no case shall the holding period be less than 2 h.
- Cool the castings to 400°F [205°C] maximum at a rate not faster than 100°F [55°C]/15 min.
- From 400°F [205°C] to ambient temperature, the castings may be cooled in still ambient air.
High Silicon Cast Iron Mechanical Requirements in ASTM A518
If buyers required, HSCI shall be given a Transvers Bend Test and Hydrostatic Test.
- Transvers Bend Test: the test bars are to be tested on supports 12in(3.5mm) apart, load at center 930Lbf[4090N], deflection at center 0.026in[0.66mm]
- Hydrostatic Test : When specified by the purchaser, subject the castings for critical applications involving pressure or vacuum conditions to a hydrostatic pressure test at a minimum of 40 psig [275 kPa]. Any leak revealed by this test shall be cause for rejection of the casting
Similar Standard:
BS 1591:1975 Specification for corrosion resisting high silicon iron castings
WW.CASTINGQUALITY.COM
PDF VIEWOur Services
- Sand Casting
Casting Quality focus on Metal Parts industry, we provide professional service in Metal Casting field.
Sand Casting is a popular metal form method, are suitable for all materiel, such as grey iron, ductile iron, malleable iron, carbon steel, stainless steel, aluminum and bronze.
- Investment Casting
also named as precision lost wax casting, mainly suitalbe for carbon steel and stainless steel parts. We also provide grey iron and ductile iron and aluminum and bronze parts by investment casting. It can achieve the best appearance with good tolerance
- Shell Casting
Shell casting method is a good option to replace investment casting and sand casting. the quality is better than sand casting parts, suitable for bulk production.
- CNC Machining
CNC Milling, CNC turning with 5 xix CNC center, we provide precision machining for all castings based on customers design drawings.
- CAD Design
Mechanical Design service based on customers requirement, our software is Solidworks and AutoCAD.
- Tools/Mold Design
Mould design and production will be served for metal casting ad plastic injection industry. Based on our more than 10 years experience, we supply professional molds for our customers in Europe and North American.
