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Stainless Steel
Stainless Steel
Stainless steel is normally referred as non-rusting steel. In metallurgy, it is a type of steel which has at least 10.5 % of chromium content in it. It does not normally corrode, rust or stain with water as ordinary steel does but it does not mean that it is fully stain proof. It is vulnerable to environments having low oxygen and high salinity. Most commonly, stainless steel is used in application in which both properties of steel and resistance to corrosion are required.
It contains sufficient amount of chromium to make an effective layer of chromium oxide which prevents further corrosion by blocking diffusion of oxygen to the steel surface.The available grades we have in stock are as follows:-
420 Stainless Steel, a modification of 410, has a higher carbon content to increase hardness, improve strength and give better wear resistance. This type of steel maintains its best corrosion resistance in the heat treated condition.
| Chemical Contents | Carbon | Chromium | Manganese | Molybdenum | Silicon | Nickel |
|---|---|---|---|---|---|---|
| Percentage | 0.35-0.45 | 12-14 | 1.00 max | 0.30 max | 1.00 max | 1.00 max |
Applications
420 stainless is widely used in medical and cutlery industries. It is suitable for applications such as surgical instruments, knives, hand tools, pump shafts and plastic moulds. 420 is not recommended for use in temperatures above the relevant tempering temperature, because of the reduction in mechanical properties.
Hardening and Tempering
Best corrosion resistance of 420 stainless is achieved when 420 is hardened and surface ground or polished. 420 is suitable for heat treatment up to 52 HRc or higher depending on the carbon content and size of the component.
This grade is a medium range stainless steel but still quite enduring in many applications. It offers good corrosion resistance in mild marine and industrial atmospheres where high tensile and yield strength with excellent toughness are required.
Applications
| Chemical Contents | Carbon | Chromium | Nickel | Manganese | Silicon |
|---|---|---|---|---|---|
| Percentage | 0.12-0.20 | 15.0-18.0 | 2.00-3.00 | 1.00 max | 1.00 max |
It is used widely in glass making and marine industries, for components such as shafts, axles, pumps, valves, bolts and nuts. Suitable for applications requiring good strength, toughness combined with reasonable resistance to corrosion.
Hardening and Tempering
Heat the component slowly to 950-1020°C and hold until the temperature is uniform throughout the steel. After adequate soaking time, quench in oil or air cool. Temper as soon as tools are hand warm. Heat carefully to a suitable tempering temperature. Soak as required and then allow to cool in air. Double tempering is recommended. 431 stainless can be tempered at lower temperatures to achieve higher tensile strengths but with lower impact properties.
SS 303 is one of the most easily machinable stianless steel among its austenitic(nonMagnetic) group. The machinable nature comes from the presence of Sulphur in it. Whilst
the Sulphur content improves machining, it also has a slightly negative e@ect in the
corrosion resistent property thus making SS304 more corrosion resistant co
SS303. The toughness is still excellent as with other austenitic grades.
Major applications include food grade shafts, springs , nuts & bolts for di@erent hygenic
applications
Chemical Composition 303
| AISI 303 | C | Si | Mn | P | S | Cr | Cu | Ni | N |
|---|---|---|---|---|---|---|---|---|---|
| min. | 0.03 | .30 | .50 | 0.015 | 0.15 | 17.0 | .20 | 8.0 | 0.11 |
| max. | 0.10 | 1.0 | 2.0 | 0.045 | 0.35 | 19.0 | 1.0 | 10.0 | 0.11 |
Heat Treatment
SS303 stainless steel cannot be hardened by heat treatment. Solution treatment or annealing can
be done by rapid cooling after heating to 1010- 1120°C.
SS 304 is the most versatile and widely used austenitic(non-Magnetic) Stainless steel. It is used in
heavily gauged parts for improved weldibility. One of its unique property is that it can be severely
deep drawn thus making it a dominant grade to be used in applications like sinks & saucepans.
Other major applications include screws, nuts , bolts, tubing, sanitary ware and brewery, food,
dairy & pharmaceutical production equipment.
Chemical Composition 304
Heat Treatment
| AISI 304 | C | Si | Mn | P | S | Cr | Ni |
|---|---|---|---|---|---|---|---|
| min. | - | - | - | - | - | 17,5 | 8,0 |
| max. | 0,07 | 1,0 | 2,0 | 0,045 | 0,03 | 19,5 | 10,5 |
SS304 stainless steel cannot be hardened by heat treatment. Solution treatment or annealing can
be done by rapid cooling after heating to 1010- 1120°C
SS316L is an austentic(non-magnetic) stainless steel with added molybdenum which makes it
more corrosion resistant and tough compared to SS304. It is also more resistant to pitting and
chemicals even at elevated temperatures. SS316L has good weldability and also reduces the
possibility of lower corrision resistance around welded areas.
Major applications of this SS grade include food preparation equipment especially in chloride
environments, Oil & Gas industries, pharmaceutical industry, medical implants, fasteners and pulp
& paper processing.
Chemical Composition 316L
| AISI 316l | C | Si | Mn | P | S | Cr | Mo | Ni | N |
|---|---|---|---|---|---|---|---|---|---|
| min. | - | - | - | - | - | 16.0 | 2.0 | 10.0 | - |
| max. | 0.03 | 0.75 | 2.0 | 0.045 | 0.03 | 18.0 | 3.0 | 14.0 | 0.11 |
Heat Treatment
Like other Austenitic grades, it cannot be Hardened. However, Solution treatment or Annealing can
be done by heating to a range between 1010- 1120°C and then cooling rapidly in air or water.
CONTACT INFO
MMT (Master Metals)
Location 1:- 53-D, Haji Park, Bundh Road, Lahore-Pakistan
Location 2:- Service Road, Ring Road, Near Sialkot-Lahore Motorway Bridge, Lakhodair, Lahore-Pakistan
Euro Steel
Location 1:- 53-D, Haji Park, Bundh Road, Lahore Pakistan
Location 2:- Service Road, Ring Road, Near Sialkot-Lahore Motorway Bridge, Lakhodair, Lahore-Pakistan
Altaf Zafar / Salman Altaf
+923008448470 +923314367768 +971566093063
info@mmturbo.com euro.steel642@hotmail.com altaf54@hotmail.com