What Do V2A and V4A Mean?

V2A and V4A are collective terms for various stainless steel grades. These designations originate from the time when engineers attempted to produce austenitic steel grades by alloying iron, chromium and nickel. The abbreviation “V” therefore stands for Versuchsschmelze, or experimental melt, and “A” stands for austenite.

V2A steels are alloyed with chromium and nickel, while V4A steels additionally contain the element molybdenum. Due to this different composition, the stainless steel grades differ in their corrosion resistance, acid resistance and suitability for various environmental conditions – especially with chloride exposure, in coastal regions or in chemical applications.

V2A vs. V4A – the Key Differences at a Glance

Property	V2A (1.4301 / 1.4305 / 1.4307)	V4A (1.4401 / 1.4404 / 1.4571)
Chromium content	approx. 18%	approx. 17%
Nickel content	8–10%	10–13%
Molybdenum	no	yes, approx. 2%
Acid resistance	medium	high
Chloride resistance	low	very high
Corrosion resistance	good	excellent
Weldability	very good	very good, 1.4571 especially stable
Application area	interiors, dry outdoor areas, standard applications	pools, coast, industry, aggressive environments

V2A: Basic Material Knowledge

Material Grade 1.4301 or AISI 304 / V2A (X5CrNi18-10)

V2A is the most commonly used chromium-nickel steel. Due to its easy handling, good weldability and high corrosion resistance, more than 50% of all stainless steels can be assigned to this group.

It is used, for example, in the construction of railings, vehicles and sinks, as well as for the production of cutlery. It is also used in the beverage, pharmaceutical and cosmetics industries. In many cases, stainless steel sheets, bent sheet metal parts or components made from V2A are used when good corrosion resistance is required but extreme acid resistance is not necessary.

The designation V2A primarily includes materials with the number 1.4301 (X5CrNi18-10) and the very similar steel with the number 1.4307 (X2CrNi18-9). Both contain significantly less carbon but more nickel. This makes the material easy to form while remaining reliable and durable in many areas of application.

Material Grade 1.4305 or AISI 303 / V2A (X8CrNi18-9)

Steels with material grade 1.4305 (X10CrNiS18-9 and X8CrNiS18-9), which contain slightly more sulphur, are also classified as V2A. The sulphur improves machinability and enables processing on automatic machines.

However, this grade should not be used where higher corrosion resistance is required, as its resistance to certain media may be reduced. For highly stressed workpieces or components that are permanently exposed to moisture or chlorides, this material is therefore less suitable.

V4A: Basic Material Knowledge

Compared with V2A, V4A is significantly more resistant to chlorides. This makes it a popular material in swimming pools and pool areas. V4A is also preferred in salt water, in the chemical industry and in coastal regions.

To achieve this increased resistance, the stainless steel is upgraded with around two percent molybdenum. A stable passive layer or oxide layer additionally protects the chromium steel from attack. Unlike ordinary structural steel, which quickly reaches its limits in aggressive environments, V4A remains reliably corrosion-resistant. A typical steel in this group is material grade 1.4401 (X5CrNiMo17-12-2).

Material Grade 1.4571 or AISI 316 / V4A (X6CrNiMoTi17-12-2)

Material 1.4571 (X6CrNiMoTi17-12-2) provides even higher corrosion resistance and is also resistant to intergranular corrosion after welding. Due to its titanium content, tool wear is higher during machining. However, when strength at high temperatures is required, it is the right choice.

For lower working temperatures, the use of the more cost-effective steel with material grade 1.4404 (X2CrNiMo17-12-2) is sufficient. This grade is often used in plant engineering, the food and cosmetics industries, as well as for highly stressed outdoor components.

Material Grade 1.4541 (X6CrNiTi18-10)

If the steel is exposed to temperatures above 600°C, the titanium-stabilised steel according to material grade 1.4541 (X6CrNiTi18-10) is recommended. It also offers good corrosion resistance under low chlorine and salt exposure. Like 1.4571, it is resistant to intergranular corrosion after welding.

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Material Selection: When V2A and When V4A?

V2A is sufficient when …

there are no increased chemical loads.
the components are decorative parts, interiors or dry outdoor areas.
a good price-performance ratio is the priority.
the material should be easy and cost-effective to process.

V4A is necessary when …

chloride exposure, salt air or aggressive media are present.
maximum acid resistance is required.
components are used permanently outdoors.
high-quality and durable products are required, for example key safes, gas springs or bent sheet metal parts.

The Differences Between V2A and V4A: Conclusion

More than half of all stainless steels used belong to the group of V2A and V4A steels. This is mainly due to the wide range of applications, the high load capacity and the easy handling of the material.

V2A is ideal for many standard tasks with good corrosion resistance and solid tensile strength, while V4A is required wherever increased acid resistance, aggressive media or permanent weathering play a role. The only disadvantage of V4A is usually its higher price, which is justified by its significantly better resistance.

The balanced price-performance ratio of these stainless steel grades ensures their widespread use – from simple corrosion-resistant household items to stainless steel sheets and bent sheet metal parts, through to complex and highly loaded industrial systems, gas springs and safety-related products such as key safes.

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