How to check grades of Stainless Steel Metal

Stainless steel is frequently utilized in the production of goods like cookware, kitchen sinks, and automobiles because it is aesthetically beautiful and corrosion-resistant. Any of a number of iron-based alloys with chromium making up at least 10.5% of its composition are referred to as stainless steel.

This typically enables the sample to be given a stainless steel grade. To distinguish between low carbon (0.03% maximum) and ‘normal’ carbon (0.06/0.07%) variants, such as 304L (1.4307) and 304 (1.4301), or to find nitrogen additives in the steel, additional studies, such as combustion analysis, may still be required. There are many grades of stainless steel metal you can buy SS metal products first you check the grades like series 200, series 300, and series 400. 

1. Series 200

The alloy 200 series is austenitic. Its chemical makeup is chromium, manganese, nitrogen, and little nickel. The 200 series has more nitrogen than the 300 and 400 series. In the 200 series, hardness was linked to nitrogen content. It has greater yield and tensile strength. It works well at cryogenic temperatures and has better impact resistance and toughness than 300 series, but lacks formability and ductility. 

2. Series 300

Austenitic stainless steel grades in the 300 series have considerable alloying additions of 18-30% chromium and 6-20% nickel.  It is made up of face-centered cubic crystals and is solid iron. The construction, automotive, and aerospace industries particularly benefit from the 300-series stainless steel grades due to their composition. Only cold working techniques can harden series 300 stainless steel since it can endure extremely high temperatures.

  • Grade 301- 

Grade 301 is a strong, malleable metal with a corrosion-resistant composition. Grade 301 stainless steel is frequently used for aesthetic structural applications because it is very flexible and abrasion-resistant. The supplier of 301 stainless steel sheet is Kloeckner Metals.

  • Grade 304-

Around the world, 50% of steel is produced in grade 304. Grade 304 is aesthetically appealing and robust because it includes 18% chromium and 8% nickel. Saline is one of its weaknesses, therefore grade 304 might pit or crevice when utilized close to salt water. 304 stainless steel sheet, 304 stainless steel plate, 304 stainless steel bar, and 304 stainless steel tube are all items that we keep in stock.

  • Grade 316-

Grade 316, the second-most-often produced steel, has a molybdenum content of 2 to 3 percent. As a result, it is more saline-resistant and is therefore better for coastal settings. Grade 316 stainless steel is also used to make a lot of surgical supplies. The extremely low-carbon version of this grade of stainless steel is provided by Kloeckner Metals. 316L stainless steel sheet, 316L stainless steel plate, 316L stainless steel bar, and 316L stainless steel tube are the different forms it comes in.

  • Grade 317-

High tensile strength is offered by this grade even at high temperatures. Compared to either grade 304 or grade 316 stainless steel, it has greater resistance to corrosion and pitting. Grade 317 stainless steel is a more expensive alloy than the majority of other grades in the 300 level due to its chemical makeup.

3. Series 400

 This line of stainless steel is slightly magnetic because it has 1% more manganese and 11% more chromium than grades in the 300-series. Additionally, this steel has a higher carbon concentration. As a result, 400-series stainless steel is stronger and more resistant to wear, but it is also more susceptible to corrosion than grades from the 300-series. The 400-series stainless steel is hardened by heat treatment.

  • Grade 430-

Grade 430 is a ferritic steel that forms easily but has poor resistance to corrosion or high temperatures. It is frequently employed for ornamental purposes, like as car trim. Backyard BBQ barbecues frequently use grade 430 stainless steel. Due to the absence of nickel, it is less expensive than grade 304. Sheets of 430 stainless steel are frequently supplied.

  • Grade 420-

One of the first carbon/iron alloys, grade 420 stainless steel is an extremely brilliant steel. This grade of steel, which has 12% chromium, has a good resistance to corrosion. Since manufacturers regularly employ it to create surgical tools, it is frequently referred to as “blade-grade steel”.

  • Grade 434-

Grade 434 is one of the most popular ferritic steels and has a good level of oxidation and corrosion resistance. Additionally, it can withstand heat up to 1500°F. Grade 434 stainless steel is often cold-formed, similar to low-carbon steel, and cannot be hardened through heat treatment. Typically, it is employed for automotive trim.

5. Series 500

It is sometimes referred to as heat-resistant chromium alloy since it is a series of heat-resistant chromium alloys. Due to the significant amount of chromium present, this grade resists distortion when heated. When excessive heat is an issue, these grades are typically used. 


In every job involving this versatile material, knowing the grade of stainless steel you’re working with is crucial. You may rapidly evaluate whether your material is ferritic, austenitic, or martensitic without having to resort to pricey laboratory tests each time by employing techniques like visual inspection and magnet testing.

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