Standards & Others -CHUO PRECISION INDUSTRIAL CO.,LTD.-

Standards & Others

Materials

Type of material ＜Iron and steel＞
Type of material ＜Stainless steel＞
Type of material ＜Nonferrous metals＞
Type of material ＜Plastic and rubber＞

Type of material＜Iron and steel＞

Name of material	Symbol	Features and general use
Rolled steels for general structure	SS330	These are general steels made by rolling a rimmed steel, which are then fabricated into steel plate, flat steel, bar steel and shaped steel. A typical steel among them is SS400 which is classified by tensile strength without specifying carbon content. They have better processibility and weldability. Application: General machine components, bolts, nuts, pins, etc.
	SS400
	SS490
	SS540
Carbon steels for machine structural use	S10C	These are steels provided with iron that contains carbon. There are 23 different types of carbon steels according to the level of carbon content ranging from 0.05% to 0.65% based on JIS. Depending on the carbon content, they differ in properties as well as in intended use. Low-carbon steel: Its carbon content ranges from 0.02% to 0.2%.It excels in machinability, weldability and cold rolling performance. Medium-carbon steel: Its carbon content ranges from 0.3% to 0.5%. It is thermally processable. However, it is inferior in weldability and cold rolling performance. High-carbon steel: Its carbon content ranges from 0.05% to 2%.It can be heat-treated to such a degree that the treated steel can be hardened further for tool-use application. It is superior in accuracy and surface roughness. Generally, S45C and S50C are used for round bars and sheet materials, respectively. Application: Bolts, pins, metal washers, crankshafts, clutches, chains, umbrellas, etc.
	S15C
	S25C
	S35C
	S45C
	S50C
	S55C
	S58C
Carbon tool steels	SK3	It is a high-carbon steel with a high carbon content ranging from 0.6% to 1.5%.Because its degree of hardness from quench hardening is higher, it is mainly used for tools. Hardening and softening which are caused by heat are likely to occur. Hardness by quenching of SK3 = Approximately HRC61 and higher. Application: Cutlery, drill, press die, jigs and tools, etc.
	SK4
	SK5
Alloy tool steels	SKS2	With addition of chemical compounds to carbon tool steels, these steels are superior to carbon tool steels in resistance to deformation volume, abrasion resistance, impact resistance and heat resistance because they are hardened by quenching. Hardness by quenching of SKS3 = RC61 and higher; SKD11 = Approximately HRC58 and higher. For cutting tools: SKS2, 7, 8, 11, 21 and 51 For shock‐resisting tools: SKS4, and 41 to 44 For cold molding die: SKS3, 31 and 93 to 95 as well as SKD4, 11 and 12 For hot molding die: SKD4 to 8 and 61 to 62 Application: Gauge, metal cutlery, press die, guide rail, etc. using this steel, which are to be fabricated through a cold molding die.
	SKS2
	SKS3
	SKS4
	SKD11
	SKD61
Chromium molybdenum steels	SCM415	Case hardening steel. It excels in abrasion resistance. Because of its low carbon content, the hardening by quenching is done only by way of carburizing and quenching. Application: Gearwheels, pins, axes, precision screws, etc.
	SCM415
	SCM435	It has high hardenabilities. It provides better weldability, persistence and abrasion resistance. Application: Axes, arms, gearwheels, cold forged components, bolts, etc.
	SCM435
High carbon chromium bearing steels	SUJ2	Bearing steels. They are excellent in machinability, hardenability and durability. Hardness by quenching = Approximately HRC63 and higher. Application: Bearings, rollers, gauges, guide rails, etc.
High carbon chromium bearing steels	SUJ2
Free cutting carbon steels	SUM21	They are the alloyed metals to which machinery structural steel and chemical components, such as sulfur, are added. According to JIS, there are 15 types of free cutting carbon steels; SUM11 to 43.It excels in machinability. Application: Precision machinery components, clocks and watches, cameras, automobile components, etc.
	SUM22L
	SUM24L
Cold rolled steels	SPCC	It is superior in accuracy of thickness. It has a clean surface, and a good cutting, bending and drawing processibility. Application: Sheet metal processing parts, covers, cases, etc.
Cold rolled steels	SPCC
Hard drawn steel wires	SW-A	Wire rods for general springs: d = 0.08 to 10.0 Application: Bedsprings, sheet springs for automobiles, guides, etc.
	SW-B
	SW-C
Piano wire rods	SWP-A	They are high strength wire rods used for strings of piano and guitar; d = 0.08 to 6.0. SWP-B is used for precision springs. Application: Piano string, guitar string, precision spring, etc.
	SWP-A
	SWP-B
Grey iron castings	FC200	They are cast irons wherein the most of carbon content is present as graphite flake. They have castability, machinability and abrasion resistance. They excel in mechanical properties, including damping performance, etc. They are inexpensive and thus used as materials for general machinery. Application: Castings, pedestals for machine tools, piston rings, gearwheels, etc.
	FC200
	FC250
	FC300
Spheroidal graphite iron castings	FCD400	They are cast irons wherein the most of carbon content is present as spheroidal graphite. Because their structure is uniformly arranged, they have high strength and are highly resistant to impact. They are also easily plated with plating. Application: Castings, automobile parts, bearings, etc.
	FCD450
	FCD500

Type of material＜Stainless steel＞

Name of material	Symbol	Features and general use
Stainless steels (austenitic stainless steels)	SUS304	Nonmagnetic. It is superior in corrosion resistance and weldability. It is hardly rusted. Application: Machine components, semiconductor equipment, chemical engineering equipment, building materials, shafts, etc.
Stainless steels (austenitic stainless steels)	SUS303	Nonmagnetic. In this stainless steel, the machinability has been improved by adding a special component to SUS304.Its corrosion resistance is inferior to that of SUS304, and rust formation occurs on the surface without exterior finish. Application: Shafts, bolts, nuts, jigs and tools, machined parts, etc.
Stainless steels (ferritic stainless steels)	SUS430	Magnetic. It has better processibility. It is unavailable for hardening by quenching. Application: General appliances for common household use, interior materials of construction, kitchen utensils, etc.
Stainless steels (martensitic stainless steels)	SUS403	Magnetic. It is superior in corrosion resistance. It is not suitable for welding. Application: Valves, shafts, cutlery, turbine blades, jet engines, etc.
Stainless steels (martensitic stainless steels)	SUS440C	Magnetic. Its degree of hardness from quenching is high. The hardness by quenching is HRC58 or higher, and it is excellent in corrosion resistance and abrasion resistance. It is not suitable for welding. Application: Cutlery, bearings, gauges, pumps, nozzles, molding dies, guide rails, etc.

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Type of material ＜Nonferrous metals＞

Name of material	Symbol	Features and general use
Aluminum alloy	A5056B	It has a greater corrosion resistance and provides a good cutting surface finish. It delivers a better dyeability as a result of anodic treatment (alumite treatment).It is primarily used for round bars. Application: Lightweight machined parts, office equipment, camera components, etc.
	A6063B	It is a typical alloy for extrusion molding. It excels in extrudability while it is available for forming into complex shapes. It is also capable of providing satisfactory performance in terms of corrosion resistance and surface treatment. Application: Aluminum building materials, electric appliances, furniture, products for daily use, piping materials, rails, etc.
	A5052P	It has a moderate strength as well as a superior corrosion resistance and processibility. It has a high resistance to fatigue while it is resistant to corrosion from seawater. It is primarily used for plate materials. Application: Lightweight machined parts, office equipment, camera components, etc.
	A2011B [noncompliant with RoHS]	Because acceptable lead content is 0.4wt% or higher, it is not compliant with RoHS. Free cutting alloy. It is superior in machinability whereas it has high strength. It has a poor corrosion resistance. Application: Free-cutting bars for automatic machine, etc.
	A2017B	It is generally called duralumin, which is hard and high-strength alloy. It has a poor corrosion resistance. It is difficult to give satin-like finish to it. Application: Airplanes, automobiles, components for two-wheeled vehicles, transportation cases of cash, etc.
Aluminum alloy casting	AC2A	It has an excellent castability, while it has high tensile strength, but it does not stretch well. Application: Manifold, main body of pump, cylinder head, automobile components, etc.
Aluminum bronze alloy casting	AlBC2	It has high strength, while it excels in corrosion resistance and abrasion resistance. Application: Gearwheels, bearings, screws, etc.
Free cutting brass alloy (brass)	C3604B [noncompliant with RoHS]	Because acceptable lead content is 4wt% or higher and its cadmium content rate is 1,000 ppm, it is not compliant with RoHS. It is superior in machinability. Application: Bolts, nuts, gearwheels, etc.
Free cutting brass alloy (brass)	C3604B Cadmium-less	Compliant with RoHS. It excels in machinability. Application: Microscope components, etc.
Brass alloy (brass)	C2801P	It is superior in strength whereas it has a good malleability. Application: Sliding components, electrical wiring devices and equipment, etc.
Copper-zinc alloy casting (brass casting)	YBSC3	It excels in corrosion resistance. It can be cast with relative ease. Application: Metal fittings for water supply and drainage, etc.
Bronze casting (gunmetal)	BC2	Compliant with RoHS It excels in pressure resistance, abrasion resistance and machinability. Application: Main body of pump, gearwheel, etc.
	BC3	Compliant with RoHS It excels in pressure resistance, abrasion resistance and machinability. Application: Main body of pump, gearwheel, etc.
	BC6 [noncompliant with RoHS]	Because acceptable lead content is 4wt% or higher, it is not compliant with RoHS. It excels in pressure resistance, abrasion resistance and machinability. Application: Bearings, valve cocks, etc.
Phosphor bronze casting	PBC2	It has greater pressure resistance and abrasion resistance. Application: Bearings, machine components, etc.
Phosphor bronze for spring	C5210P	It is harder than phosphor bronze and provides better springiness. Application: Springs for electric appliances, springs for button battery's contact members, leaf springs, etc.
Ceramics	-	It has electrical resistance property and resists heat deformation. It is less impact-resistant and it cannot be processed easily. Application: Heater, etc.

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Type of material＜Plastic and rubber＞

Name of material	Symbol	Features and general use
Polyacetal (Commodity name: DURACON)	POM	It excels in strength and chemical resistance, while it is superior in fatigue- and abrasion-resistance characteristics because of its self-lubricating ability and its friction factor is low. The impact resilience is great. Its heat resistance temperature is approximately 105℃.It is made from thermoplastic resin. Application: Gearwheels, cams, motor components, fasteners, valves, etc.
Acrylonitrile butadiene styrene (ABS)	ABS	Because the mold shrinkage factor is small and it has impact resistance, it is well balanced. It provides an excellent plate adhesion property. Its heat resistance temperature is approximately 60℃to 110℃.It is made from thermoplastic resin. Application: Injection-molded articles, such as components for automobiles, electric appliances and products for daily use.
Polycarbonate	PC	It is suitable for injection molding, because it has a high strength and excels in impact resistance; temperature deformation occurs less frequently; and its mold shrinkage factor is small. However, it is less resistant to chemicals. Its heat resistance temperature is approximately 120℃.It is made from thermoplastic resin. Application: Protective barrier, lighting equipment,, lens for traffic signal, bottles, etc.
Polyethylene	PE	It is soft and superior in electrical resistance property, chemical resistance and water resistance. Its heat resistance temperature is approximately 80℃to 120℃.It is made from thermoplastic resin. Application: Packaging films, laminate films, toys and products for daily use.
Urea resin	UF	Although it has a fine colorability, it is less resistant to impact. Its heat resistance temperature is approximately 77℃.It is made from thermosetting resin. Application: Adhesive agent, tableware, etc.
Polyamide (nylon)	PA	It excels in oil resistance and heat resistance; its friction factor is small; and it is highly resistant to abrasion. It has water-absorbing property, which, in turn, may easily cause change in dimensions and a property change. Other available nylons are the PA6 and PA66 of which properties are somewhat different from those of this nylon. Its heat resistance temperature is approximately 80℃to 120℃.It is made from thermoplastic resin. Application: Gear, pulley, shaft, etc.
Polyvinyl chloride	PVC	It is excellent in chemical resistance and electrical resistance property. Its domestic production volume is the largest in Japan. Its heat resistance temperature is approximately 66℃to 79℃.It is made from thermoplastic resin. Do not use those PVCs that contain the specific substance banned from use (phthalic ester). Application: Pipes, rain gutters, films, sheets, phonodiscs, etc.
Polyester	FRP	It is superior in mechanical strength. It has better electrical resistance property, solvent resistance, acid resistance and water resistance. It can be formed into large-sized article. Its heat resistance temperature is approximately 150℃to 170℃.It is made from thermosetting resin. Application: Fuel tanks, architectural materials, boards, automobile components, sporting goods, etc.
Polytetrafluoroethylene (tetrafluoroethylene) (Commodity name: Teflon)	PTFE	It is excellent in heat resistance, chemical resistance and electrical resistance property. It is expensive. Its moldability is poor and it is soft. Its heat resistance temperature is approximately 290℃.It is made from thermoplastic resin. Application: Gasket, packing, surface coating for clothes iron and frying pan, etc.
Epoxy resin	EP	It has a small mold shrinkage factor; it excels in mechanical properties; and it can be solidified at ambient temperature. Its heat resistance temperature is approximately 120℃to 290℃.It is made from thermosetting resin. Application: Adhesive agent, paint, fishing rod, connector cover, etc.
Phenol (Bakelite)	PF	It is excellent in electrical resistance property, heat resistance and strength. It is inexpensive; it has a superior processibility; and its mold shrinkage factor is small. Its heat resistance temperature is approximately 120℃to 260℃.It is made from thermosetting resin. Application: Insulating components, electrical components, shell mold, etc.
Polymethylmethacrylate (acrylic)	PMMA	It excels in transparency and weather resistance, and it has a high strength. It is also superior in insulation quality. Its heat resistance temperature is approximately 60℃to 93℃.It is made from thermoplastic resin. Application: Light electrical appliances' components, lighting equipment's components, craft products, building materials, insulating materials, machine components, etc.
Polyether ether ketone （PEEK）	PEEK	Its color is dark whitish. It is excellent in all properties, including heat resistance, chemical resistance, abrasion resistance, machinability and so on. Its heat resistance temperature is approximately 250℃. Application: Bolts, nuts, etc. for semiconductor fabrication equipment and chemicals manufacturing equipment.
Silicone	Si	It excels in heat resistance, chemical resistance, self-lubricating ability and abrasion resistance. Its heat resistance temperature is approximately 316℃.It is made from thermosetting resin. Application: Electrically insulating components, heat-resistant paints and components, etc.
Natural rubber	NR	Natural rubber. It is elastic and resistant to abrasion. Its surface friction force is great and therefore it is not slippery on the surface. Application: Tire, hose, belt, packing, vibration absorption plate, etc.
Synthetic natural rubber	IR	It has almost the same properties as those of natural rubber. It has smaller surface friction. Application: Tire, hose, belt, packing, vibration absorption plate, etc.
Urethane rubber	U	It is superior in terms of dynamic strength. It has oil resistance and abrasion resistance. Application: Components that require high elasticity as well as high strength.
Nitrile rubber	NBR	It excels in oil resistance, abrasion resistance and aging-resistant property. It is used for general O rings. Application: Oil sealant, gasket, packing, oil-proof hose, etc.
Silicone rubber	Si	It is provided with highly sophisticated heat resistance and cold resistance. This rubber is not hardened even when temperature changes. It is suitable for those O rings that are required to remain soft even when temperature changes. Application: Packing, gasket, oil sealant, vibration-proof rubber, etc.
Fluororubber	FPM	It is provided with the highest heat resistance and chemical resistance. It is suitable for high-performance O rings. Application: Packing and gasket for rockets, pump components, etc.

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