DIWA 353: High-Temperature Weldable Steel for Boilers, Vessels, and Piping

DIWA 353 is a weldable steel for higher temperature service. It is characterized by high 0.2 % proof stress at elevated temperatures. DIWA 353 is produced using basic oxygen steelmaking process. Its properties are achieved by normalizing and tempering. It is used as plate or formed part for boilers, pressure vessels, piping and other fabricated parts operating at temperatures up to 400 °C.

DIWA 353 is equivalent to steel type 13MnNiMo5-4, Material No. 1.8807. In Germany, it is defined as 13MnNiMo5-4 in VdTÜV-material data sheet 384 for supervised installations e.g. for pressure vessel instal- lations in accordance with the AD-2000 Merkblätter for temperatures from -10 °C up to 400 °C. Application according to corresponding standards has to be checked for each separate case. This material specification applies to heavy plates with thicknesses from 6 to 150 mm; higher thicknesses can be agreed upon.

For mechanical properties: For thicknesses > 150 mm values have to be agreed upon in the state of inquiry.

Properties

Mechanical

Property	Temperature	Value	Comment
Charpy impact energy, V-notch	0 °C	31 J	*The specified values are minimum values for the average of 3 tests. No individual value is to be less than 70 % of the specified minimum. For plate thickness below 11 mm the test can be carried out on Charpy-V specimens or Charpy-V-type specimens with reduced width. The minimum impact value will be reduced proportionally to the reduction of the specimen’s cross section
	20 °C	39 J	*
Elongation		18 %	min. for plate thickenss t ≤ 150 mm \| transverse specimens (ambient temp.), A5
Tensile strength		570 - 740 MPa	for plate thickness t ≤ 150 mm \| transverse specimens (ambient temp.)
Yield strength		375 MPa	min. ReH for plate thickness 125 < t ≤ 150 mm \| transverse specimens (ambient temp.)
		380 MPa	min. ReH for plate thickness 100< t ≤ 125 mm \| transverse specimens (ambient temp.)
		390 MPa	min. ReH for plate thickness 50< t ≤ 100 mm \| transverse specimens (ambient temp.)
		400 MPa	min. ReH for plate thickness t ≤ 50 mm \| transverse specimens (ambient temp.)
	100 °C	353 MPa	min. Rp0.2 for plate thickness 125 < t ≤ 150 mm \| transverse specimens
	100 °C	363 MPa	min. Rp0.2 for plate thickness 100 < t ≤ 125 mm \| transverse specimens
	100 °C	373 MPa	min. Rp0.2 for plate thickness 50 < t ≤ 100 mm \| transverse specimens
	100 °C	393 MPa	min. Rp0.2 for plate thickness t ≤ 50 mm \| transverse specimens
	200 °C	338 MPa	min. Rp0.2 for plate thickness 125 < t ≤ 150 mm \| transverse specimens
	200 °C	348 MPa	min. Rp0.2 for plate thickness 100 < t ≤ 125 mm \| transverse specimens
	200 °C	358 MPa	min. Rp0.2 for plate thickness 50 < t ≤ 100 mm \| transverse specimens
	200 °C	378 MPa	min. Rp0.2 for plate thickness t ≤ 50 mm \| transverse specimens
	250 °C	333 MPa	min. Rp0.2 for plate thickness 125 < t ≤ 150 mm \| transverse specimens
	250 °C	343 MPa	min. Rp0.2 for plate thickness 100 < t ≤ 125 mm \| transverse specimens
	250 °C	353 MPa	min. Rp0.2 for plate thickness 50 < t ≤ 100 mm \| transverse specimens
	250 °C	373 MPa	min. Rp0.2 for plate thickness t ≤ 50 mm \| transverse specimens
	300 °C	324 MPa	min. Rp0.2 for plate thickness 125 < t ≤ 150 mm \| transverse specimens
	300 °C	333 MPa	min. Rp0.2 for plate thickness 100 < t ≤ 125 mm \| transverse specimens
	300 °C	343 MPa	min. Rp0.2 for plate thickness 50 < t ≤ 100 mm \| transverse specimens
	300 °C	363 MPa	min. Rp0.2 for plate thickness t ≤ 50 mm \| transverse specimens
	350 °C	314 MPa	min. Rp0.2 for plate thickness 125 < t ≤ 150 mm \| transverse specimens
	350 °C	324 MPa	min. Rp0.2 for plate thickness 100 < t ≤ 125 mm \| transverse specimens
	350 °C	333 MPa	min. Rp0.2 for plate thickness 50 < t ≤ 100 mm \| transverse specimens
	350 °C	353 MPa	min. Rp0.2 for plate thickness t ≤ 50 mm \| transverse specimens
	400 °C	294 MPa	min. Rp0.2 for plate thickness 125 < t ≤ 150 mm \| transverse specimens
	400 °C	299 MPa	min. Rp0.2 for plate thickness 100 < t ≤ 125 mm \| transverse specimens
	400 °C	304 MPa	min. Rp0.2 for plate thickness 50 < t ≤ 100 mm \| transverse specimens
	400 °C	309 MPa	min. Rp0.2 for plate thickness t ≤ 50 mm \| transverse specimens

Chemical properties

Property	Value	Comment
Aluminium	0.015 %	min. tot product and heat
Carbon	0.15 %	max. heat
	0.17 %	max. product
Chromium	0.15 - 0.45 %	product
	0.2 - 0.4 %	heat
Iron	Balance
Manganese	0.95 - 1.7 %	product
	1 - 1.6 %	heat
Molybdenum	0.15 - 0.44 %	product
	0.2 - 0.4 %	heat
Nickel	0.55 - 1.05 %	product
	0.6 - 1 %	heat
Niobium	0.02 %	max. heat
	0.025 %	max. product
Phosphorus	0.02 %	max. heat
	0.025 %	max. product
Silicon	0.05 - 0.56 %	product
	0.1 - 0.5 %	heat
Sulfur	0.003 %	max. heat
	0.004 %	max. product

Technological properties

Property

Cold Forming

DIWA 353 can be cold formed according to the general procedures. The guidelines according to EN 1011-2 and VdTÜV-material data sheet 384 shall be observed.

Delivery condtion

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

Delivery condition: Normalized and tempered, unless otherwise agreed.

Flame cutting and welding

DIWA 353 can be welded and flame cut according to the general procedures. The guidelines according to EN 1011-2 and VdTÜV-material data sheet 384 shall be observed. Welding conditions should lead to cooling time t8/5 10 - 30 s.

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. For more detailed information about forming or welding please refer to our brochure "Technical Information DIWA 353" on www.dillinger.de

Heat Treatment

Normalizing¹ 870-950 °C	Tempering¹ 580-690 °C	Stress relieving 530 - 600 °C²
After equalization over the whole section holding time: 15 min for t ≤ 50 mm 30 min for t > 50 mm. Cooling in still air.	After equalization holding time at least 30 min, but not exceeding 180 min. Cooling in still air.	Thickness mm ≤ 15 > 15 ≤ 30 > 30 ≤ 150	Time min³ ≥ 15 ≥ 30 about 60
1- Temperatures and times are concerning the product. 2- Where the stress relief temperature has to be above 580 °C this has to be clarified in the state of inquiry. 3- Normally the maximum holding time shall be restricted to 150 min. If the holding time exceeds 90 min orin 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.

Temperatures and holding time 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

DIWA 353 can be hot formed according to the general procedures. The guidelines according to EN 1011-2 and VdTÜV-material data sheet 384 shall be observed.

Other

Identification of plates: Unless otherwise agreed the marking is carried out with low stress steel stamps with at least the following information:

steel grade (DIWA 353 or 13MnNiMo54))

heat number

number of mother plate and individual plate

the manufacturer's symbol

authorized inspection representative’s sign

Processing history

Fully killed, fine grained steel with metallurgical treatment in the ladle.

Processing methods

The entire processing and application techniques are of fundamental importance to the reliability of the pro- ducts made from this steel. The user should ensure that his design, construction and processing methods are aligned with the material, correspond to the state-of-the-art that the fabricator has to comply with and are suitable for the intended use. The customer is responsible for the selection of the material. The recom- mendations in accordance with EN 1011-2 should be observed.

Surface condition

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

Testings

Sampling, testing method and tests are in accordance with the provisions in EN 10028 and VdTÜV-material data sheet 384 except that, unless otherwise agreed, the 0.2 % proof stress test at elevated temperatures is carried out at 350 °C and 400 °C instead of 300 °C The plates are delivered with inspection certificate 3.2 or 3.1 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.

For plate thicknesses * 15 mm, the fulfillment of one of the three quality classes Z15, Z25 or Z35 in accordance with EN 10164 or similar rules can be stipulated on the order. These quality classes correspond to a minimum reduction of area on through-thickness tensile test specimens of 15, respectively 25, respectively 35 % (minimum value for the average of 3 tests).

Tolerances

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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