EN 10088-2 X3CrNiMo13-4 1.4313 Stainless Steel Plate

EN 10088-2 X3CrNiMo13-4 1.4313 stainless steel plate is a soft martensitic flat product supplied to EN 10088-2, the European standard for stainless steel sheet, plate and strip for general purposes. X3CrNiMo13-4 combines a low carbon content of no more than 0.05 % with 12.0 – 14.0 % chromium, 3.5 – 4.5 % nickel, 0.30 – 0.70 % molybdenum and at least 0.020 % nitrogen. The low carbon and the nickel give a tough martensite after quenching and tempering, with much better toughness than the 13 % chromium hardening grades. EN 10088-2 lists 1.4313 only as hot rolled plate (product form P) up to 75 mm, delivered quenched and tempered as +QT780 or +QT900. The grade is also standardised for pressure equipment in EN 10028-7.

SHH STEEL works as a steel sourcing partner with long-term relationships with Chinese stainless mills that roll quenched and tempered soft martensitic plate. For large tonnages, the buyer can contract directly with a suitable mill, with SHH STEEL assisting for a modest service fee and handling follow-up and documents. For small orders we consolidate demand, so that 1 – 5 t lots are placed against genuine mill production instead of stock of unknown origin. Each shipment can be released after third-party inspection by TUV, ABS, BV, DNV, CCS or an agency the buyer nominates, and payment by TT or LC is accepted. The rest of this page covers the technical side of EN 10088-2 1.4313 and the steps we take so that the sheet that arrives is the sheet that was ordered.

The table below lists the concerns buyers raise most often when sourcing EN 10088-2 X3CrNiMo13-4 sheet and plate from China, and how SHH STEEL deals with each of them.

1.4313 plate can be ordered to EN 10088-2 for general purposes or to EN 10028-7 for pressure equipment; see EN 10028-7 1.4313 pressure vessel plate. In the American system the nearest grade is ASTM A240 S41500 sheet and plate, also ordered as ASME SA240 S41500 plate for ASME work. S41500 has wider nickel and molybdenum ranges and a different manganese range.

The pressure-equipment version in EN 10028-7 may set its own testing and property requirements; we have not reproduced them here, so check that standard where it applies. SHH STEEL confirms which standard governs before ordering.

1.4313 is one of only two martensitic grades in EN 10028-7:2016, the other being 1.4418; see EN 10028-7 1.4418 pressure vessel plate.

Edition note: the values on this page are taken from EN 10088-2:2014. A revised edition (EN 10088-2:2024) has since been published. If your contract names the newer edition, SHH STEEL checks the order against that text before production, and any difference is raised at the quotation stage rather than after rolling.

The 1.4313 chemical composition below is the cast (heat) analysis from EN 10088-2:2014 Table 4. Values are percentages by mass; a single figure is a maximum.

The nitrogen minimum is a feature of the EN grade that S41500 does not specify. The low carbon limit is the key to the toughness and weldability of the soft martensitic steels. SHH STEEL checks nickel, molybdenum and nitrogen on every certificate as part of the 1.4313 chemical composition review.

Product analysis tolerances (EN 10088-2 Table 5)

A product analysis is a check made on the delivered sheet. It is not mandatory under EN 10088-2; it is carried out when agreed at the time of enquiry and order, and SHH STEEL can arrange it through a partner laboratory. The permissible tolerances on the cast limits are:

Where several product analyses are made on one cast, individual results may exceed the maximum or fall below the minimum, but not both for the same element. If a product analysis is required, it should be stated in the order together with the Table 5 tolerances.

The 1.4313 mechanical properties below are the room-temperature values from EN 10088-2:2014 Table 10 for martensitic steels in the heat-treated condition. The values depend on the heat-treatment condition as well as on the product form.

Table 10 gives 70 J minimum impact energy for +QT780 plate thicker than 10 mm. The table extract we checked shows no separate impact value for +QT900, so the requirement should be confirmed and written into the order.

The bar standard EN 10088-3 gives somewhat different values for 1.4313 (for example a lower proof strength for +QT780), so bar data should not be used for plate. SHH STEEL can arrange tensile and impact tests, witnessed by a third-party inspector when required.

Minimum 0.2 % proof strength at elevated temperature (EN 10088-2 Table 15)

Values in MPa. EN 10088-2 gives no values above these temperatures for 1.4313.

EN 10088-2 Table A.4 gives the following guideline temperatures for 1.4313:

Unlike the 13 % chromium hardening grades, 1.4313 is air-cooled after hot forming and is tempered at much higher temperatures. The lower tempering range gives +QT900; the higher range gives the tougher +QT780. The Euro Inox fabrication tables give the same ranges.

EN 10088-2 lists no annealed condition for 1.4313 plate. A stockholder datasheet (Steelinox) mentions soft annealing at 600 – 650 °C with slow cooling for other product forms; this is not an EN 10088-2 delivery condition. The Annex A temperatures are guidelines, and we check that the delivery condition is stated on each certificate.

The values below are approximate reference figures for X3CrNiMo13-4 at room temperature, as listed in EN 10088-1 and reproduced in stockholder datasheets. They are suitable for design estimates and weight calculation; where a figure is critical, use EN 10088-1 itself.

Compared with the 13 % chromium grades such as 1.4006 (215 GPa, 30 W/(m·K) in EN 10088-1), 1.4313 has a lower modulus and lower thermal conductivity. The steel is magnetic.

1.4313 has the moderate corrosion resistance of 13 % chromium martensitic steels, helped by its molybdenum. A stockholder datasheet (Steelinox) states that its corrosion resistance resembles that of 1.4057 and that it is used with good toughness from -60 °C to +300 °C in the quenched and tempered condition. The ISSF guide on stainless steels in hydro turbines names 1.4313 and 1.4418 as the most suitable grades for parts that need cavitation erosion resistance, and notes that 1.4418 has better corrosion resistance. EN 10088-2 gives no corrosion data.

Where higher corrosion resistance is needed at similar strength, the ISSF guide points to 1.4418; see EN 10028-7 1.4418 pressure vessel plate.

Corrosion behaviour depends on medium, temperature and surface finish, so it should be confirmed for each application.

1.4313 is much more weldable than the higher-carbon martensitic grades because of its low carbon, but it still needs a controlled procedure. Datasheets differ in how they rate it: a stockholder datasheet (Steelinox) rates weldability as poor, while another (EHG) states that it can be welded with conventional arc processes under certain conditions such as preheating and tempering.

• The Euro Inox fabrication tables list an approximate preheating temperature of 350 °C for 1.4313 and filler materials 1.4351 or 1.4313; the qualified procedure governs the actual values.
• Use low-hydrogen processes and dry consumables.
• Temper after welding to restore toughness, at the temperature set by the procedure.
• EN 10088-2 does not specify welding procedures; these are general industry practices and published guidelines.

These points reflect industry practice for soft martensitic (13 % Cr – 4 % Ni) stainless steels rather than requirements of EN 10088-2, which does not specify welding procedures. In the SHH STEEL workshop, blanks and slit strips are cut with clean, burr-free edges so that seam, spot and tube welding run without edge preparation problems.

1.4313 plate is delivered quenched and tempered and is normally cut, machined and welded in that condition. Its strength is high for a stainless steel, so bending is limited to generous radii and should be trialled.

Machinability is described as average in a stockholder datasheet (Steelinox). Thermal cutting is common for this low-carbon grade, but preheating thick plate before plasma or oxy-fuel cutting reduces the risk of edge cracks.

We run our own workshop next to the warehouse, so 1.4313 martensitic plate can be delivered as cut pieces, sawn blocks, rings or drilled parts instead of raw mill sizes. Details are on our steel cutting services and bending and forming services pages.

EN 10088-2 lists 1.4313 only as hot rolled plate.

Plate thicker than 75 mm is outside the range of Table 10, so its properties must be agreed. State the condition, impact test temperature and ultrasonic testing requirement in the order.

SHH STEEL can supply 1.4313 soft martensitic plate and X3CrNiMo13-4 plate in standard sizes or cut to your drawing, including cut blanks and rings for runners, impellers and valve bodies.

Surface finish is ordered by the process route symbols of EN 10088-2 Table 6; trade names from ASTM and JIS are shown for reference. Not every route is available for every grade, and the mill confirms which ones it can supply.

Most 1.4313 plate is machined, so 1C or 1E is often the economical choice. Parts exposed to flowing water are usually ground or polished after machining.

The usual 1.4313 equivalent is UNS S41500, often called 13-4 or 415. It is close, but its ranges are wider than the EN grade.

A heat can meet both 1.4313 and S41500 if nickel is 3.5 – 4.5 %, molybdenum 0.50 – 0.70 %, manganese 0.50 – 1.00 %, silicon no more than 0.60 % and nitrogen at least 0.020 %. SHH STEEL can order such dual-certified material when the buyer needs both.

1.4313 vs 1.4418, 1.4021 and 1.4006

Compared with 1.4418, 1.4313 has less chromium and nickel; the ISSF guide notes that 1.4418 has better corrosion resistance. Compared with EN 10088-2 1.4021 plate and EN 10088-2 1.4006 plate, 1.4313 has far less carbon and adds nickel and molybdenum, so it is much tougher and easier to weld, at higher cost; it is not a hardening grade for blades. Compared with the bar version in EN 10088-3, plate values can differ, so the standard for each product should be checked.

Typical applications of 1.4313 martensitic plate listed in published sources (Euro Inox, ISSF and stockholder datasheets) include:

• Hydro turbine runners and guide vanes
• Pump and compressor components
• Rotor wheels in power plants
• Valve components
• Oil and petrochemical equipment
• Tools and dies for pressure die casting

For pressure equipment, 1.4313 plate is ordered to EN 10028-7; for other uses, EN 10088-2 applies. 1.4313 martensitic sheet is not listed in EN 10088-2, which covers only plate for this grade.

1.4313 QT780 plate (+QT780) gives the higher elongation and the specified impact energy; +QT900 gives higher strength. SHH STEEL can advise on the condition for each part.

For 1.4313 the main risks are wider-range substitutes, the wrong standard and incomplete impact testing.

None of these steps is complicated, but they need to be agreed at the start. When you send an enquiry, tell us which of these points matters most to you, and the order will be built around it.

Every 1.4313 order is supported by documents and checks that make the material traceable to the heat:

• Cast analysis with nickel, molybdenum and nitrogen checked
• Tensile test for +QT780 or +QT900
• Impact test (KV2) as specified or agreed
• Ultrasonic testing of thick plate when agreed
• Additional checks through our third-party testing service: PMI, dimensional, flatness and surface inspection

If the order does not name an inspection document, EN 10088-2 requires only a test report 2.2. Because this is rarely enough for turbine, pump and valve or export work, SHH STEEL supplies an EN 10204 3.1 inspection certificate as standard and a 3.2 certificate when an independent inspector (TUV, ABS, BV, DNV, CCS or an agency you nominate) witnesses testing and countersigns the document.

Ordering example and lead time

Following the pattern of the example in EN 10088-2, a typical order line would read: 5 t hot rolled plate, 50 mm × 2 000 mm × 4 000 mm, EN 10088-2, steel X3CrNiMo13-4 (1.4313), heat-treatment condition +QT780, process route 1D, inspection certificate 3.2 to EN 10204. Mill production lead time is generally 30 – 40 days from order confirmation, depending on the rolling schedule, the size and the tests requested; quenched and tempered plate includes the heat-treatment stage at the mill. Consolidated small lots follow the same mill schedule, and we send progress updates at rolling, testing and packing.

• Mill relationships: long-term cooperation with Chinese stainless mills helps us secure competitive pricing and steadier delivery for 1.4313 and related martensitic and ferritic grades.
• Direct mill contracts: for larger tonnages you can contract directly with a suitable mill, for a modest service fee, while we handle follow-up and documents.
• Order consolidation: 1 – 5 t lots are combined so they can be placed against genuine mill production.
• Own workshop: slitting, cut-to-length, laser cutting, bending and protective film before shipment.
• Inspection and certificates: third-party inspection by TUV, ABS, BV, DNV, CCS or your nominated agency, with EN 10204 3.1 or 3.2 certificates.
• Flexible payment: TT, LC or a combination of both.
• Port logistics: coil and sheet are packed seaworthy with heat-number labels and shipped through our worldwide shipping service, together with other grades if needed.

As a 1.4313 plate supplier SHH STEEL also stocks and sources the wider range of stainless steel sheets and plates, so mixed orders of different stainless grades can travel in one container with one set of paperwork.

EN 10088-2 X3CrNiMo13-4 1.4313 is the low-carbon 13 % chromium, 4 % nickel soft martensitic steel, supplied as quenched and tempered plate up to 75 mm for hydro turbines, pumps, compressors and valves. Choosing it is the easy part. Getting genuine material that matches the certificate, in the gauge and finish your parts need and on a predictable schedule, is where a sourcing partner earns its place, and that is the work SHH STEEL does every day through long-term mill cooperation, consolidation and its own workshop.

The next step is simple. Send SHH STEEL your drawing, or an enquiry with the quantity, thickness, width, finish and delivery destination, and we will judge whether a direct mill contract or consolidation with processing fits your order better, and quote accordingly. Send your sizes and quantities for a quotation.