Fine Grain Quenched And Tempered Steel Plate Hot Rolled For Sour Gas Service
|Place of Origin:||China|
|Certification:||ISO9001:2015, ABS, BV, CCS, DNV GL, NKK|
Payment & Shipping Terms:
|Minimum Order Quantity:||5 metric tons|
|Packaging Details:||In bundles, standard seaworthy packing for export|
|Delivery Time:||15 days|
|Payment Terms:||L/C, T/T|
|Supply Ability:||3000 metric tons per month|
|Material:||Alloy Steel||Process:||Hot Rolled|
|Shape:||Flat Plate||Surface Treatment:||Plain And Smooth|
|Length:||Up To 12000mm||Condition:||Quenched And Tempered|
|Application:||Molds And Tooling||Feature:||Excellent Polishability And Machinability|
heavy steel plate,
bulletproof steel plate
P20 MOULD STEEL is a prehardened CrMnMo-alloyed tool steel for the construction of plastic molds with superior surface requirements on molds. It is characterized by excellent polishability, photoetchability, spark erosion behaviour and dimensional stability as well as good machinability. P20 MOULD STEEL is a typical tool steel for the mold construction in North America and South East Asia.
Designation and range of application
P20 MOULD STEEL is a modified version of AISI P20 according to ASTM A681. Compared to DIMO 2311 and DIMO 2738, P20 MOULD STEEL has, as a result of its adjusted analysis resulting in a lower carbon equivalent, advantages at repair welding and at thermal-chemical surface layser treatment, as e.g. nitriding.
P20 MOULD STEEL is available as plate with sheared or flame cut edges in the following dimensions:
|Thickness||≥ 12 ≤ 130 mm||≥ 1/2 ≤ 5 inch||> 130 ≤ 165 mm||> 5 ≤ 6 1/2 inch|
|Width (1)||≥ 1000 ≤ 2500 mm||≥ 40 ≤ 98 1/4 inch||≥ 1000 ≤ 2050 mm||≥ 40 ≤ 80 1/2 inch|
|Length||≥ 4500 ≤ 6000 mm||≥ 177 1/2 ≤ 236 inch||≥ 4000 ≤ 6000 mm||≥ 157 1/2 ≤ 236 inch|
(1) Widths < 1250 mm (49 in) have to be ordered with an even number of plates
Other dimensions available upon request.
The P20 MOULD STEEL production route is designed to achieve the excellent properties of this mold steel type with superior surface requirements. P20 MOULD STEEL is characterized by high dimensional stability. The P20 MOULD STEEL production route provides excellent polishability, photoetchability and spark erosion properties. Therefore P20 MOULD STEEL is particularly suitable for molds with superior surface requirements if suitable manufacturing processes are employed.
The good sulfidic and oxidic cleanliness and the modification of the few remaining inclusions by the calcium treatment lead to good machinability and minimize the tool wear.
These properties can only be achieved by the combination of the following P20 MOULD STEEL-production steps:
· desulphurization to S ≤ 0.002 % for high sulfidic cleanliness
· chemical analysis in dependence of dimensions
· vacuum degassing
· argon stirring for high sulfidic and oxidic cleanliness
· calcium treatment for inclusion shape control
· special casting conditions to assure the high cleanliness and homogenity
· High Shape Factor Rolling (high thickness reduction) to realize a closely packed structure
· appropriate heat treatment parameters according to analysis and dimensions to assure homogeneous hardness distribution over the plate and to minimize residual stresses
For the ladle analysis the following limiting values in % are applicable
(1) alloyed depending on dimensions
P20 MOULD STEEL is supplied in the prehardened (air hardened + tempered) condition.
Mechanical and technological properties in the delivery condition
Unless otherwise agreed the hardness at the surface in the delivery condition is 280 - 325 HB. According to EN 18265, table B2, this corresponds to a tensile strength of approximately 890 - 1030 MPa (128 - 148 ksi).
· Heat analysis
· Dimension control
· Surface inspection
The hardness (HB) is tested on surface of each rolled mother plate.
· Ultrasonic testing
Unless otherwise agreed, 100 % ultrasonic testing is performed on each plate in the delivery condition in accordance with EN 10160. As admissible limit applies quality class 4 in table 5 of EN 10228-3.
Upon request, an ultrasonic testing in accordance with ASTM A 578, Level C, supplementary requirements S1 and S9 is possible. In this case the desired testing type has to be indicated on the order.
Unless otherwise agreed, the results are documented in an inspection certificate 3.1 in accordance with EN 10204.
Identification of plates
Unless otherwise agreed the marking is carried out via steel stamps with at least the following information:
· steel grade (P20 MOULD STEEL)
· heat number
· number of mother plate and individual plate
· the manufacturer’s symbol
· inspector’s sign
P20 MOULD STEEL is delivered in the prehardened condition; therefore further heat treatment is generally not necessary. This avoids the risks and costs involved by the hardening and tempering of a mold after processing. Should a heat treatment become necessary, the following data are recommended:
|soft annealing||stress relieving||Preheating before hardening||hardening||tempering|
720 - 740 °C (1330 - 1360 °F) 2 - 4 h,
hardness about 230 HB
in the delivery condition max.
580 °C (1080 °F)
1 - 2 h, furnace cooling
450 - 650 °C (840 - 1200 °F)
|840 - 860 °C (1540 - 1580 °F)/oil; for low wall thicknesses warm bath hardening at 200 - 230 °C (390 - 450 °F) is possible||in accordance with tempering diagram to required hardness (min. 1 h/25 mm (1 in) wall thickness)|
General technical delivery requirements
Unless otherwise agreed, the general technical delivery requirements in accordance with EN 10021 apply.
Unless otherwise agreed, tolerances are in accordance with EN 10029 / ASTM A 6 with the following restrictions:
|plate thickness:||in accordance with EN 10029, class C|
|plate width:||≥1000 mm≤1500 mm||±25 mm||≥40≤59 in||±1 in|
|>1500 mm≤2050 mm||±40 mm||>59≤80 1/2 in||±1 1/2 in|
|>2050 mm||±50 mm||>80 1/2 in||±2 in|
|plate length:||± 1000 mm||± 40 in|
Unless otherwise agreed, short lengths ≥2 m (79 in) are part of the delivery.
Unless otherwise agreed, the specifications will be in accordance with EN 10163-2 class A, subclass 3. Shot blasting of upper and lower surface of the plate and shop priming are possible on request.
If special requirements, which are not listed in this specification, are to be met by the steel due to its intended use or processing, these requirements are to be agreed before placing the order.