Automotive Sensor Pump Valve MIM Parts

316L (S31603), an austenitic stainless steel based on molybdenum, has better resistance to general corrosion, pitting corrosion, and crevice corrosion than conventional chromium-nickel austenitic alloys such as 304.

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Automotive Sensor Pump Valve MIM Parts
Item	Material	Production Process		Sintering Temperature			Mold		Custom
Filter	316L	Metal Injection Molding		1350°C-1500°C			To be customized		Yes
Chemical Composition	C ：≤0.08 Si：≤1.00 Mn：≤2.00 S ：≤0.030 P ：≤0.035 Cr：16.00～18.50 Ni：10.00～14.00 Mo：2.00～3.00
Available Materials	Low carbon stainless steel, titanium alloy (Ti, TC4), copper alloy, tungsten alloy, hard alloy, high temperature alloy (718, 713)
Finish	Dimensional Accuracy		Product Density			Appearance Treatment				Appropriate Weight
Roughness 1～5μm	（±0.1%～±0.5%）		92～95%			Mirror Reflection				0.03g～400g）
Mechanical properties	Tensile strength σb (MPa): ≥480 Conditional yield strength σ0.2 (MPa): ≥177 Elongation δ5 (%): ≥40 Reduction of area ψ (%): ≥60 Hardness: ≤187HB; ≤90HRB; ≤200HV Density: 7.98g/cm3; Specific heat capacity ratio (20°C): 0.502kJ/(g*K)
Thermal conductivity (W/(m*K))	100℃				300℃			500℃
	15.1				18.4			20.9
Heat treatment	olid solution 1010 ~ 1150 ℃ rapid cooling.

• 316LAutomotive Sensor Pump Valve MIM Parts Properties
316L (S31603), an austenitic stainless steel based on molybdenum, has better resistance to general corrosion, pitting corrosion, and crevice corrosion than conventional chromium-nickel austenitic alloys such as 304. These alloys have higher ductility, stress corrosion resistance, compressive strength and high temperature resistance. In applications requiring better resistance to general and pitting corrosion, 316L is preferred over 316 or 304L because 316L contains 2-3% molybdenum, while 304 and 316 contain only 1-2% molybdenum.
304L alloy and 316 and 316L copper-nickel-molybdenum alloys also have the typical characteristics of austenitic stainless steel, that is, good processability and formability.

• 316L automotive sensor pump valve corrosion resistant
Compared with 18-8 stainless steel, 316, 316L and 317L have better corrosion resistance in atmospheric environment and other mild environments. In general, media that do not corrode 18-8 stainless steel will not corrode molybdenum-containing grades. The only exception is highly oxidizing acids, such as nitric acid, to which molybdenum-containing stainless steels are less resistant.
In sulfuric acid solutions, 316 and 317L have better corrosion resistance than other chromium-nickel type grades. Both grades have good corrosion resistance to highly concentrated solutions at temperatures up to 120°F (38°C). Of course, in-service testing is essential, as operating conditions and acidic contamination can significantly affect corrosion rates. These two grades have better corrosion resistance than other types of stainless steel when concentrating sour gases. However, in such applications, the effect of acid concentration on the corrosion rate is considerable and this factor must be carefully considered.
Molybdenum-containing stainless steel 316 and 317L have certain corrosion resistance to various other environments. The corrosion data below shows that these alloys exhibit superior corrosion resistance in boiling 20% phosphoric acid solutions. They are also widely used for processing hot organic acids and fatty acids. Molybdenum-containing stainless steels are often used in the manufacture and handling of food, automobiles, and pharmaceutical products because metal contamination must be minimized.
Generally speaking, under the same environmental conditions, 316, 316L can be regarded as having the same performance as 317L. But in the environment that can cause welding and intergranular corrosion in the heat-affected zone, there are exceptions. In such media, 316L and 317L are more often selected because of the low carbon content, which can improve the resistance to intergranular corrosion.

• 316L automotive sensor pump valve pitting/crevice corrosion
Increased chromium, molybdenum, and nitrogen content can improve the pitting/crevice corrosion resistance of austenitic stainless steel in the environment of chloride or other halide ions. Pitting corrosion is calculated by PREN (pitting equivalent), PRE = Cr+3.3Mo+16N. 316, 316L's PREN=24.2, 304's PREN=19.0, which reflects that 316 (or 316L) has better pitting corrosion resistance than 304. 317L has a molybdenum content of 31%, PREN=29.7, indicating that it has better pitting corrosion resistance than 316.
304 stainless steel is resistant to pitting corrosion and crevice corrosion in a water environment containing 100ppm chloride. 316 and 317L containing molybdenum are resistant to pitting corrosion and crevice corrosion in water environments containing 2000ppm and 5000ppm chloride respectively. Although these two alloys have been used with some success in seawater environments (19,000ppm chloride), such use is not recommended. Alloy 2507 with 4% molybdenum, 25% chromium, and 7% nickel is designed for use in saltwater environments. 316l, 317L are only suitable for some marine environment applications, such as ship guide rails, exterior walls of buildings near the ocean, etc. 316l, 317L alloys did not show corrosion in the 100-hour 5% salt spray test (ASTM B117)

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