DIWA 393 Fine-Grained Steel (EN 1.6311) – High-Temperature Weldable Performance

DIWA 393 is a weldable fine grained steel for higher temperature service. It is characterised by high 0.2 % proof stress at elevated temperatures. DIWA 393 is produced using basic oxygen steelmaking process. Its properties are achieved by water quenching and tempering .

DIWA 393 is applied as plate or formed part for boilers and pressure vessels operating at temperatures of - 20 °C to 400 °C

DIWA 393 / 20MnMoNi4-5, Material No. 1.6311, is standardized in EN 10028, part 2 and approved in accordance with VdTÜV-material data sheet 440/1 for supervised installations in thicknesses of 30 up to 250 mm.

This material data sheet applies to heavy plates with thicknesses from 30 to 250 mm.

Sampling, testing method and tests are in accordance with the provisions in EN 10028 and VdTÜV material data sheet 440/1.

Properties

Mechanical

Property	Temperature	Value	Testing Standard	Comment
Charpy impact energy, V-notch	-20 °C	19 J	EN 10045-1	lowest individual value \| transverse specimens
	-20 °C	27 J	EN 10045-1	average
	0 °C	28 J	EN 10045-1	lowest individual value \| transverse specimens
	0 °C	40 J	EN 10045-1	average \| transverse specimens
	20 °C	35 J	EN 10045-1	lowest individual value \| transverse specimens
	20 °C	50 J	EN 10045-1	average \| transverse specimens
Elongation		18 %	EN 10002-1	min. for plate thickenss t ≤ 250 mm \| transverse specimens (ambient temp.), A5
Tensile strength		560 - 700 MPa	EN 10002-1	for plate thickness 150 < t ≤ 250 mm \| transverse specimens (ambient temp.)
		570 - 710 MPa	EN 10002-1	for plate thickness 60 < t ≤ 150 mm \| transverse specimens (ambient temp.)
		590 - 750 MPa	EN 10002-1	for plate thickness t ≤ 40 mm \| transverse specimens (ambient temp.)
		590 - 730 MPa	EN 10002-1	for plate thickness 40 < t ≤ 60 mm \| transverse specimens (ambient temp.)
Yield strength		400 MPa	EN 10002-1	min. ReH for plate thickness 150 < t ≤ 250 mm \| transverse specimens (ambient temp.)
		440 MPa	EN 10002-1	min. ReH for plate thickness 100 < t ≤ 150 mm \| transverse specimens (ambient temp.)
		450 MPa	EN 10002-1	min. ReH for plate thickness 60 < t ≤ 100 mm \| transverse specimens (ambient temp.)
		460 MPa	EN 10002-1	min. ReH for plate thickness 40 < t ≤ 60 mm \| transverse specimens (ambient temp.)
		470 MPa	EN 10002-1	min. ReH for plate thickness t ≤ 40 mm \| transverse specimens (ambient temp.)
	100 °C	381 MPa	EN 10002-5	min. Rp0.2 for plate thickness 150 < t ≤ 250 mm \| transverse specimens
	100 °C	419 MPa	EN 10002-5	min. Rp0.2 for plate thickness 100 < t ≤ 150 mm \| transverse specimens
	100 °C	429 MPa	EN 10002-5	min. Rp0.2 for plate thickness 60 < t ≤ 100 mm \| transverse specimens
	100 °C	438 MPa	EN 10002-5	min. Rp0.2 for plate thickness 40 < t ≤ 60 mm \| transverse specimens
	100 °C	448 MPa	EN 10002-5	min. Rp0.2 for plate thickness t ≤ 40 mm \| transverse specimens
	200 °C	367 MPa	EN 10002-5	min. Rp0.2 for plate thickness 150 < t ≤ 250 mm \| transverse specimens
	200 °C	404 MPa	EN 10002-5	min. Rp0.2 for plate thickness 100 < t ≤ 150 mm \| transverse specimens
	200 °C	413 MPa	EN 10002-5	min. Rp0.2 for plate thickness 60 < t ≤ 100 mm \| transverse specimens
	200 °C	423 MPa	EN 10002-5	min. Rp0.2 for plate thickness 40 < t ≤ 60 mm \| transverse specimens
	200 °C	432 MPa	EN 10002-5	min. Rp0.2 for plate thickness t ≤ 40 mm \| transverse specimens
	300 °C	353 MPa	EN 10002-5	min. Rp0.2 for plate thickness 150 < t ≤ 250 mm \| transverse specimens
	300 °C	389 MPa	EN 10002-5	min. Rp0.2 for plate thickness 100 < t ≤ 150 mm \| transverse specimens
	300 °C	398 MPa	EN 10002-5	min. Rp0.2 for plate thickness 60 < t ≤ 100 mm \| transverse specimens
	300 °C	406 MPa	EN 10002-5	min. Rp0.2 for plate thickness 40 < t ≤ 60 mm \| transverse specimens
	300 °C	415 MPa	EN 10002-5	min. Rp0.2 for plate thickness t ≤ 40 mm \| transverse specimens
	350 °C	342 MPa	EN 10002-5	min. Rp0.2 for plate thickness 150 < t ≤ 250 mm \| transverse specimens
	350 °C	377 MPa	EN 10002-5	min. Rp0.2 for plate thickness 100 < t ≤ 150 mm \| transverse specimens
	350 °C	385 MPa	EN 10002-5	min. Rp0.2 for plate thickness 60 < t ≤ 100 mm \| transverse specimens
	350 °C	394 MPa	EN 10002-5	min. Rp0.2 for plate thickness 40 < t ≤ 60 mm \| transverse specimens
	350 °C	402 MPa	EN 10002-5	min. Rp0.2 for plate thickness t ≤ 40 mm \| transverse specimens
	400 °C	327 MPa	EN 10002-5	min. Rp0.2 for plate thickness 150 < t ≤ 250 mm \| transverse specimens
	400 °C	359 MPa	EN 10002-5	min. Rp0.2 for plate thickness 100 < t ≤ 150 mm \| transverse specimens
	400 °C	367 MPa	EN 10002-5	min. Rp0.2 for plate thickness 60 < t ≤ 100 mm \| transverse specimens
	400 °C	375 MPa	EN 10002-5	min. Rp0.2 for plate thickness 40 < t ≤ 60 mm \| transverse specimens
	400 °C	384 MPa	EN 10002-5	min. Rp0.2 for plate thickness t ≤ 40 mm \| transverse specimens

Chemical properties

Property	Value	Comment
Aluminium	0.01 - 0.055 %	product
	0.01 - 0.05 %	heat
Carbon	0.13 - 0.25 %	product
	0.15 - 0.23 %	heat
Chromium	0.2 %	max. heat
	0.25 %	max. product
Copper	0.2 %	max. heat
	0.25 %	max. product
Iron	Balance
Manganese	0.95 - 1.6 %	product
	1 - 1.5 %	heat
Molybdenum	0.41 - 0.6 %	product
	0.45 - 0.64 %	heat
Nickel	0.35 - 0.85 %	product
	0.4 - 0.8 %	heat
Nitrogen	0.012 %	max. product
	0.015 %	max. heat
Phosphorus	0.02 %	max. heat
	0.025 %	max. product
Silicon	0.1 - 0.46 %	product
	0.15 - 0.23 %	heat
Sulfur	0.01 %	max. heat
	0.013 %	max. product
Vanadium	0.02 %	max. product
	0.02 %	max. heat

Technological properties

Property

Application areas

Boiler installations in accordance with Technical Rules TRD 101, EN 12952 etc. for temperatures up to 375 °C.

Pressure vessel installations in accordance with the AD 2000-Merkblätter series W and HP for temperatures of - 10 °C to 375 °C.

Delivery condtion

Unless otherwise agreed: water quenched and tempered

If the heat treatment is to be performed during processing, the plates can be delivered in the normalized condition, and in exceptional cases in the as rolled condition by special agreement before the order. In this case testing of the mechanical properties is provided on the basis of separately heat treated specimens.

Unless otherwise agreed, the general technical delivery requirements in accordance with EN 10021 apply.

Flame cutting and welding

DIWA 393 can be hot or cold formed and can be welded and flame cut according to the general procedures. The guidelines according to EN 1011 and VdTÜV-material data sheet 440/1 shall be observed. For the fabrication of pressure vessels in accordance with AD 2000 Merkblatt in the context of PED qualified welding consumables have to be applied. For other applications the use of qualified welding consumables is recommended.

General note

If special requirements, which are not listed in this material specification, are to be met by the steel due to its intended use or processing, these requirements are to be agreed before the order.

The indications in this data sheet are product descriptions. This data sheet is updated if necessary. The current version is available from the mill or as download at www.dillinger.de.

Heat Treatment

Quenching and tempering		Stress relieving
Austenitizing + quenching 870 to 940 °C After temperature achievement over the whole section cooling in water	Tempering 610 to 690 °C Holding time after temperature achievement over the whole section: 30 min, cooling in still air	580 - 620 °C
		thickness mm 30 > 30 ≤ 250	time min ≥ 30 ≥ 60
Heating and soaking in the temperature range between 580 and 620 °C. Temperature measurement at the part’s surface.

Generally the maximum stress relieving time shall be restricted to 150 min. If it exceeds 90 min or in case of repeated heat treatment the lower range of recommended temperatures shall apply. If stress relieving and tempering are joined together in one process, the tempering conditions apply.

The stress relieving temperature must not be higher than the tempering temperature applied at Dillinger Hütte. It should rather be situated in a sufficient distance of at least 30 °C below the tempering temperature in order to avoid a decrease of the mechanical properties. In many cases the stress relieving temperature during processing is determined by other influencing factors and therefore can not always be 30 °C below the tempering temperature applied at Dillinger Hütte. Therefore we recommend to consult us so that we can check the scheduled stress relieving conditions.

Temperatures and holding times are determined by the steel manufacturer as a function of the plate thickness and the chemical composition. In order to preserve the mechanical properties the fabricator should ensure that the subsequent heat treatments correspond to those applied by the manufacturer (indicated in the plate inspection document).

Hot forming

We point out to the fact that after hot forming a complete renewed quenching and tempering treatment in accordance with Dillinger Hütte indications has to be performed.

Other

Unless otherwise agreed the marking is carried out via steel stamps with at least the following information:

steel grade (DIWA 393 and/or 20MnMoNi45)

heat number

number of mother plate and individual plate

the manufacturer's symbol

inspectors' sign

Processing history

Fully killed steel with metallurgical treatment in the ladle and vacuum degassing on tank degassing unit.

Surface condition

Surface condition: Unless otherwise agreed, the provisions in accordance with class B2 of EN 10163 are applicable.

Testings

Tensile test at ambient temperature (transverse test specimens) in accordance with EN 10002-1

Hot tensile test (transverse test specimens) in accordance with EN 10002-5

The fulfilment of one of the three quality classes Z15, Z25 or Z35 in accordance with EN 10164 or similar standards can be stipulated on the order.

Sampling, testing method and tests are in accordance with the provisions in VdTÜV-material data sheet 440/1. Unless otherwise agreed the following tests are performed:

tests	acceptance unit
- Tensile test at ambient temperature, transverse specimens, acc. EN 10002-1 - Impact test Charpy-V, transverse specimens, at 0 °C acc. EN 10045-1	per rolled plate ≤ 15 m at one end, 1⁄4 width > 15 m at both ends, 1⁄4 width
Hot tensile test at elevated temperatures, transverse specimens, at 300 °C acc. EN 10002-5	per heat at one end, 1⁄4 width; for orders in accordance with AD 2000 W1 per heat and dimensional range
material identity test	per rolled plate
upon request: product analysis	per heat

Type/location of specimen:

Tensile test at ambient temperature	Hot tensile test	Impact test
plate thickness 30 mm: flat tensile test specimens with both rolled surfaces plate thickness > 30 mm: flat tensile test specimens with at least one rolled surface or cylindrical tensile test specimens with axis in 1⁄4 plate thickness	plate thickness 30 mm: flat tensile test specimens with both rolled surfaces plate thickness > 30 mm: cylindrical tensile test specimens with axis in 1⁄4 plate thickness	Plate thickness ≤ 40 mm: Charpy-V-test specimens near surface Plate thickness > 40 mm: Charpy-V-test specimens in 1⁄4 plate thickness

Sampling, testing method and tests are in accordance with the provisions in EN 10028 and VdTÜV material data sheet 440/1. The plates are delivered with inspection certificate 3.1 or 3.2 in accordance with EN 10204. The document type and, in case of inspection certificate 3.2, the inspection representative are to be stated on the order.

Tolerances

Unless otherwise agreed, tolerances are in accordance with EN 10029, with class B for the thickness and class N for the flatness.

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