It means a lowsulphur steel with a tested level of ductility through the z axis of the plate, as opposed to the transverse or longitudinal axes. About through thickness tensile testing z direction. The lab trials were focused on z25 throughthickness properties of thick plates with a similar chemical composition used in the described trial as it can be seen in table 5. Its cover products having a thickness between 15 mm and 400 mm inclusive of steel with a specfied. Steel suppliers can provide plate which has been through thickness tested with a guaranteed stra value of over 20%. Apparently steel with impurities can split similar to timber. Domis 59 characterizing the through thickness properties of ultrahigh strength steel plater. First, the throughthickness properties of a thick plate are significantly. This provision has been removed from the new standard. Experimental study on the throughthickness properties of structural. Now the objective is to determine up to which degree of thickness such a. Generally, the requirement for through thickness properties is therefore understood to be a requirement for one of the three quality classes of improved deformation properties z15, z25, z35 defined in en 10164. Designs for low temperature applications l20 and l40 can be done using australian standards. We can provide a complete solution covering multiproducts to meet your specific project needs.
Changes to the asnzs 3678 standard structural steel. W14 steel plates and wide flats with specified minimum through. Lmats has several other innovative advanced ndt nondestructive testing capabilities. Jun, 2018 in welded steel constructions, where z25z35 load is carried in the through thickness direction of the plate, z25z35 tearing may lead to tear fracturing. The principle reason why a steel product would not meet. Study on the welding technique of the q460ez35 extra thick steel plate. Through thickness testing ttp testing meeting class z35 according to astm a370 or en 10164. Mr kipman you are right, that material is api 2h gr50, it is unacceptable for through thickness property. The sulphur levels which have such a significant influence on through thickness properties may be verified by looking at the mill certificates.
Throughthickness properties of heavy welded steel teejoints. These cracks, which most often occur parallel to the surface of the plate are called lamellar tearing and bring about a deterioration of the steel in the through thickness direction. We have a range of special eh36 plates where the plates are z35 through tested at the mill thus guaranteeing acceptance of the through thickness qualities when they are delivered to site. Steels for offshore and naval structural applications industeel. Increased range of throughthickness testing options allows specifiers to utilise a higher level z35 of throughthickness testing than was available with the previous version of the standard, for applications requiring welded joints with high restraint. Steel products with improved deformation properties. In order to make a comparison of the transverse and through thickness properties, the transverse specimens, which are parallel to the rolling direction, were also sampled from the thick plate at one fourth of the plate thickness. Zdirection testing of steel plate mechanical engineering. Z quality is determined by through thickness testing, hence z quality plate is sometimes referred to as through thickness tested plate.
Throughthickness compression testing and theory of carbon. Standard size or tailored size in accordance with equipmenttankage cutting plan, from mill indent with long lead time with specific project technical conditions to exstock item with rush delivery deadline. If through thickness testing to en 10164 is specified, this automatically includes ultrasonic testing to en 10160 for plate. Z35 35 25 for plates of thickness less than 15 mm the standard en 10164 does not require throughthickness tensile tests and these tests are not carried out. Increased range of through thickness testing options allows specifiers to utilise a higher level z35 of through thickness testing than was available with the previous version of the. Through thickness tensile test or z direction tensile test is performed to evaluate mechanical properties mostly in steel. Standard specification for throughthickness tension. As your experience, please let me know if my concern is correct or incorrect.
Additional testing such as through thickness test to z15 z35, hic test, ultrasonic can be performed at the request of customers. Evaluation of deformation properties perpendicular to the surface en 10164 it is stated in en 10164 that the reduction of area in a through thickness tensile test is a good general guide to the lamellar tear resistance, i. It covers products having a thickness between 15 mm and 400 mm. Z testing before zquality plates are delivered, special zsamples are taken on which the reduction of area in the fracture during tensile testing is recorded. A high value of the reduction of area is a sign of good zcharacteristics. Values for reduction of area in the throughthickness direction table 2. Questioncan be applied through thickness tension test for all kind of materiala240316l, a240s31803 per astm a770. These tensile tests are used to establish the through thickness ductility of the steel, and categorise it into one of three levels z15, z25 or z35. They are also ultrasonically tested to en10160 acceptance classes s1 and s2. As a throughthickness specimen cut from the steel product is stretched it reduces in area by ductile necking before fracture. Beverly steel api 2h grade50 z35 offshore steel plate. Z15,z25 and z35 test and standard tech specification. In this example, the specification is calling for as1548pt460nr, tested to a minimum requirement of 25 percent reduction in area in the through thickness direction.
The through thickness tension testing of the shipbuilding steel plate shows that its reduction of area is over 35%. Increased range of through thickness testing options allows specifiers to utilise a higher level z35 of through thickness testing than was available with the previous version of the standard, for applications requiring welded joints with high restraint. The pd also lists a series of practical measures to reduce the risk of lamellar tearing. Tensile test of mild steel specimen on utm duration. Increased range of through thickness testing options. To meet z35 quality, three specimens must average at least 35% reduction in area in this test with no individual value below 25%. Lamellar tearing occurs in joints producing high through thickness strain, eg t joints or corner joints. Several types of test specimen shall have specified values of plate thickness, diameter, minimum radius, and length of reduced section. Z direction through thickness test through thickness tensile test or z direction tensile test is performed to evaluate mechanical properties mostly in steel. The principal purpose of the testing is to provide a measure of the resistance of a steel plate to lamellar tearing. Through thickness compression testing and theory of carbon fibre composite materials a thesis submitted to the university of manchester for the degree of doctor of philosophy in the faculty of engineering and physical sciences 2011 luke francis thompson school of mechanical, aerospace and civil engineering. I wonder how can the result become too high value of ttp like that. Api 2h grade 50 has a minimum yield strength of 50ksi 345mpa and a minimum transverse charphy vnotch impact toughness of 30 ftlbf 41j at 40degree c with intermediatestrength and heat treated normalized carbonmanganese structural steel plate for welded construction of offshore structuresoffshore platforms.
The properties in the through thickness direction zdirection are not specified. This document specifies through thickness properties and associated test methods for flat products and sections of steel. Ludwigson 48 stud welding of prolongations to plate for through thickness tension test specimensw. Using a special production process which includes reduction of the sulphur content in the steel, it is however possible to supply plates socalled zqualities with specified properties in the through thickness direction. The tension testing method shall provide a measure of the resistance of a steel plate to lamellar tearing. Experimental study on the throughthickness properties of. Astma770 standard specification for throughthickness. Allows some level of throughthickness testing over a wider range of plate. It covers products having a thickness between 15 mm and 400 mm inclusive of steels with a specified minimum upper yield strength r eh or proof strength r p0,2 960 mpa 1 for which improved through thickness properties are required.
The concern is delamination of the plate in this undefined direction. This document may be applied as a supplement to all product standards for flat products and sections of fully killed steels, except stainless steels. The key to producing z quality plate lies in two factors. The throughthickness deformation properties are determined with the tensile test using test pieces that are machined in through thickness direction of the plate. For test results to be meaningful it is important that the laboratory understands the relevant standards on how to prepare test specimens and perform the tests.
What are the options and how can they assist in design. Excellent flatness and surface condition tolerances typical of plate products. Z15,z25 and z35 test and standard tech specification news. Jr indicates that the charpy impact test was conducted to 27 joules minimum at room temperature. W14 steel plates and wide flats with specified minimum. Although ndt non destructive testing is a compromise of several essential variables to derive a test output as a constant 18072017, lmats staff endeavours to provide test results that can be used for the estimation of fitness for purpose for asset life extension. In t or cruciform joints, full penetration butt welds will be particularly susceptible. The inclusions are small, so they cannot readily be revealed by ultrasonic testing. Two z quality steels are specified, z25 for normal ship applications and z35 for more severe applications. A770though thickness tension test astm testing materials. Unge gar til stalet nlmk dansteel as nlmk dansteel as. Standard specification for throughthickness tension testing. Through thickness ductility is used as a measure of the resistance of steel plate to lamellar tearing during and after welding.
I really need an api 2h gr50z but our vendor have offered an api 2h gr50 with additional through thickness tensile test i didnt accept then they provived us report with result of 82% in reduction of area. Astma770 standard specification for through thickness tension testing of steel plates for special applications lamellar tearing. In welded steel constructions, where z25 z35 load is carried in the through thickness direction of the plate, z25 z35 tearing may lead to tear fracturing. Technical delivery conditions defines three zquality classes z15, z25 and z35. However, the same manufacturing process is used for all the z plates regardless of the thickness. Nevertheless, if zgrade steel is needed, it should be specified as a option 4 in en 100251 in terms of one of the three levels z15, z25 or z35 of through thickness ductility according to en 10164. Zqualitiesztesting lamellar tearing as a rule, welding produces considerable stresses in the base material which can result in the formation of cracks. Lmats ndt non destructive testing chemical analysis. Excellent metallurgical properties as guaranteed by z35 through thickness tensile testing and ut inspection, thanks to the structural isotropy and homogeneity achieved through the forging and rolling process. Norms and z testing can be carried out in accordance with norms and rules from. Steels for offshore and naval structural applications. The z z35 printer is a lowend device designed for use at z25z35.
Our advantages special heavy plate thickness can be up to 700mm single plate weighs 60mt esr steel thickness can be up to 390mm, reached the highest international ut test standard z35 through thickness thickness can be up to 400mm level 1 ut test thickness can be up to 400mm quenched and tempered steel with the most complete heat treatment. Alternative test specimen may be used in place of the standard test specimen. S3 tensile test additional tensile test shall be taken for head and tail corner of each parentplate s4 through thickness testing ttp testing meeting class z35 according to astm a370 or en 10164. Operating on a global scale through an international sales and distribution network, thyssenkrupp materials trading is your partner for longterm success. Allows specifiers to utilise a higher level z35 of through thickness testing than was available with the previous version of the standard, for applications requiring welded joints with high restraint. The primary purpose of the test is to measure resistance. Certificates dating back to are available online for uncoated steel. In welded steel constructions, where the load is carried in the through thickness direction of the plate, lamellar tearing may. In the event of any doubt as to the composition of the products, a product analysis shall be carried out at the request of the surveyor. Lmats is nata accredited to offer pec, eca, paut, tofd, crt.
Dual purpose magnetic induction and eddy current gauges and probes would be beneficial in the case of an automobile where the doors might be steel and the hood might be aluminum. Other plates that come without the additional z35 test can be tested with 3rd party verification quickly and efficiently. For test results to be meaningful it is important that the laboratory understands the relevant standards on how to prepare test specimens and perform 3768 tests. Structural steel grade designations according to en10025. Nlmk dansteel as nlmk dansteel as zqualitiesztesting. Increased range of through thickness nzx options allows specifiers to utilise a higher level z35 of through thickness testing than was available with the previous version of the standard. The number minimum yield strength for smallest thickness. However, their effect may be assessed by carrying out through thickness tensile tests in accordance with en 10164. Steel plates and wide flats with specified minimum through thickness properties z quality w14. Through thickness specimens from the base metal are shown in fig. Z15,z25 and z35 test and standard dec 17, 2016 zqualitiesz testing. Contact any of our laboratories in melbourne, sydney, albury, newcastle, brisbane or perth for further information. The test involves applying tensile forces on a test specimen whose axis is perpendicular to the rolled surfaces of steel plate.
In the new version they are mandated for compliance. Oct 07, 2011 develop a working knowledge of the test methods related to coating thickness measurement and the instruments available for both common and complex applications. Dear gent, please let me join your forum i have just received a through thickness tensile test report from a laboratory with result is 82% material is plate 40mm api 2h gr50. Plate thickness and specimen size considerations in through thickness tension testing d. The letter z merely indicates the direction of the tensile test, i. A test batch shall comprise either the rolled length the unit subjected to the heat treatment or the number of items from the same heat specified in the following sections. Through thickness tensile testingsample failure youtube. Through thickness properties of heavy welded steel teejoints by minerva imelda melendrez athesis presented to the graduate and research committee oflehigh university in cdidacy for the degree ofmaster ofscience iii civil engineering lehigh university may 6,1998. Through thickness properties are characterised by specified values for reduction of area in a through thickness tensile test. All standard plate grades can be supplied as zqualities.
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