>What Is The Difference Between 300 And 400 Series Stainless Steel

What Is The Difference Between 300 And 400 Series Stainless Steel

Austenitic stainless steels with non-magnetic characteristics make up the 300 series. In their composition, they contain 17 to 19 percent chromium, 8 to 10 percent nickel, manganese, carbon, sulphur, phosphorus, and silicon. One of the most often utilised types of steels are these corrosion-resistant stainless steels. The different grades are 302, 304, and 316. The most popular stainless steel is 304, and the second most popular is 316, both of which are utilised in a variety of applications. Ferritic stainless steels in the 400 series include 11 percent chromium, as well as lower amounts of sulphur, phosphorus, manganese, and other metals. Nickel is present in some materials only in trace amounts. Compared to the 300 series, they have weak corrosion resistance, but excellent abrasion resistance.

300 And 400 Series Stainless Steel Price Difference

The 400 series of stainless steels is less expensive than the 300 series because the nickel concentration is lower. Applications requiring corrosion resistance are utilised the 300 series, while those requiring high wear and tear resistance are used the 400 series. The 300 series, however, is the most popular because to the fact that most applications prioritise corrosion resistance over wear and tear capabilities.

300 And 400 Series Corrosion Resistance Levels

While the 400 series' chromium component offers some corrosion resistance, it does not fare well against steam, running water, chlorides, oxidising agents, or reducing agents. The 300 series, however, offers superior strength and corrosion resistance against the majority of these corrosive substances. Some grades, such grade 316, have greater corrosion resistance against particular agents like the chloride ion. Consequently, the 300 series of products are utilised in maritime, oil and gas, petroleum, petrochemical, oil and gas, and other applications where the products pose a risk of corrosion. The 400 series is utilised in applications where wear and tear are high but corrosion resistance is not the main issue, including transportation, platforms, handrails, and other sections of automobiles.


300 Vs 400 Series Tensile And Yield Strength

The yield strength of the 400 series grades is approximately 30 ksi, compared to an approximate 40 ksi for the 300 series grades. The 300 series has a high tensile strength of 100ksi, compared to the 400 series' tensile strength of roughly 70ksi. The steels in the 400 series are different since they don't include nickel. The variation in corrosion resistance is primarily due to the mix of chromium and nickel.

300 And 400 Series Stainless Steel Weldability

When compared to the 400 series, the 300 series is better for welding. When being welded, the 400 series can bend and crack. Both of these materials can be joined using the majority of conventional techniques, but the 300 series could be joined without harming the material. The 300 series' 304 grade sheet metal is frequently used to join the 400 series, which is prone to cracking, in order to create a more fluid weld puddle and provide better gap bridging.


Features & Specification of 300 Series and 400 Series
CORROSION RESISTANCE Excellent Good Moderate
MACHINABILITY Excellent Poor/Gummy – will not hold bright finish Good
WELDABILITY OF STEEL Excellent Good Moderate¹
SOUR SERVICE (SS) ENVIRONMENTS Excellent Poor Acceptable
STRENGTH OF STEEL Excellent Poor / Not hardenable by heat treatment Good
ANTI-GALLING Good Poor / Parts can seize and gall Moderate / Parts can seize
WEAR RESISTANCE Excellent Moderate Good/Further hardening diminishes
SHOCK RESISTANCE Excellent Excellent Good
RETAINED STRESS Less retained stress Poor / High degree of memory Moderate / High degree of memory
FINISH OPTIONS TGP Bearing-Fit, RTOS Centerless TGP, Cold Drawn Hot Roll, TGP
YIELD STRESS (TYP) 65,000 PSI minimum 304L = 25,000 PSI
316L = 30,000 PSI
410 = 90,000 PSI
416 = 110,000 PSI
316L = 1400°F
410 = 1100°F
416 = 1100°F
TENSILE STRESS (TYP) 94,000 PSI minimum 304L = 70,000 PSI
316L = 75,000 PSI
410 = 120,000 PSI
416 = 124,000 PSI


300 Series Stainless Steel grades
302 bit higher strength and corrosion resistance is similar to 304
301 Known for Better weldability and fatigue strength compared to SS 304
321 Addition of titanium alloy
304 Most popular grade, also known as 18/8 stainless steel, A2, ISO 3506
316 ANother most popular grade after 304, also known as marine grade, A4, ISO 3506
303 Also known as "A1", ISO 3506
309 temperature resistance is good compared to grade 304


400 Series Stainless Steel grades
409 Its one of the cheap grade mainly used in automobile
408 Contains 8% Nickel. 11% Chromium
416 Contains additional sulfur
430 Have excellent formability
440 Contains additional carbon, comes different grades 440A, 440B, 440C and 440F
410 less corrosion resistant and Wear resistant grade
420 Also known as surgical steel, have good polishability