316 StainlessAustenitic stainless steel for use in wells with low levels of H2S and CO2
Grade 316 is the standard molybdenum-bearing grade, second in importance to 304 amongst the austenitic stainless steels. The molybdenum gives 316 better overall corrosion resistant properties than Grade 304, particularly higher resistance to pitting and crevice corrosion in chloride environments. It has excellent forming and welding characteristics. It is readily brake or roll formed into a variety of parts for applications in the industrial, architectural, and transportation fields. Grade 316 also has outstanding welding characteristics. Post-weld annealing is not required when welding thin sections.
Grade 316L, the low carbon version of 316 and is immune from sensitisation (grain boundary carbide precipitation). Thus it is extensively used in heavy gauge welded components (over about 6mm). Grade 316H, with its higher carbon content has application at elevated temperatures, as does stabilised grade 316Ti.
The austenitic structure also gives these grades excellent toughness, even down to cryogenic temperatures.
Excellent in a range of atmospheric environments and many corrosive media – generally more resistant than 304. Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 60°C. Considered resistant to potable water with up to about 1000mg/L chlorides at ambient temperatures, reducing to about 500mg/L at 60°C.
316 is usually regarded as the standard œmarine grade stainless steel, but it is not resistant to warm sea water. In many marine environments 316 does exhibit surface corrosion, usually visible as brown staining. This is particularly associated with crevices and rough surface finish.
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|Weight %||0.07 max||1.0 max||2.0 max||0.045 max||0.030 max||16.50 – 18.50||2.00 – 2.50||10.50 – 13.50|
|Wireline Diameter (in)||Minimum Breaking Load (lbf)||Typical Breaking Load (lbf)||Minimum UTS (N/mm²)||Typical UTS (N/mm²)||Yield Strength (0.2% of PS)||Elastic Limit||Modulus of Elasticity (N/mm²)||Recommended Safe Load||Sheave Diameter (in)||Minimum Wraps|
|0.092″||1400||1520||1450||1570||80-90% UTS||22 – 28% UTS||15.3 X 10´||75% UTS||11||8|
|0.108″||1920||2000||1450||1510||80-90% UTS||22 – 28% UTS||15.3 X 10´||75% UTS||13||8|
|0.125″||2500||2670||1400||1500||80-90% UTS||22 – 28% UTS||15.3 X 10´||75% UTS||15||8|
|0.140″||3100||3170||1400||1420||80-90% UTS||22 – 28% UTS||15.3 X 10´||75% UTS||17||8|
|0.160″||4000||4100||1370||1405||80-90% UTS||22 – 28% UTS||15.3 X 10´||75% UTS||20||8|
|Wireline Diameter||Density (g/cm³)||Coefficient of Liner Expansion (Mm/m/°C)||Wireline Weight (lb/1000ft)||Minimum Wireline Stretch (in/100ft/100lb)||Thermal Conductivity (W/m.K)||Specific Heat (j/kg.K)||Resistivity (Ohm Cm)||Magnetic Permeability|
|H²S + CO²||May be used in concentrations of up to 30% of CO² with no H²S present.|
|Chloride (Brine, salt etc.)||May be used in concentrations of up to 2-3%.|
|H²S + CO² + Chloride||May be used in concentrations of CO² up to 30% providing Chlorides do not exceed 2-3% and no H²S|