Home>API>API RP 934-E:2010 pdf download

API RP 934-E:2010 pdf download

API RP 934-E:2010 pdf download.Recommended Practice for Materials and Fabrication of 11/4CR-1/2Mo Steel Pressure Vessels for Service Above 825 °F(440°c).
NOTE The i-factor c not applicable to these aloys, and an X-bar limit has been adopted ea a mews of restricting the concenlration of elements that contribute to reheat cracklig of the steel.
The chemistry restrictions described above along with other aspects of this RP are designed to provide the steel with resistance to the reheat crackkig phenomenon described in API 938-A.
5.4 Heat Treatment
All product loans shall be annealed, normalized and tempered (N&T) or quenched and tempered (O&T) to meet the required mechanical properties For thickness >2 in. (50 mm). O&T may be required to meet fracture toughness specifications for the steel. Annealed steel and lower Class levels should be specified for applications involving high temperature service where the primary failure mechanism is creep rupture. For equipment exposed to cyclic service and where fatigue is an important factor the use of N&T or O&T heat treatment and higher class levels may be more appropriate.
5.5 Mechanical Properties
5.5.1 Location of Test SpecImens
Test specimens for establishing the tensile and impact properties shall be removed from the following locations:
a) Plate—From each mother-plate with the same heat treatment transverse to the rolling direction in accordance with SA-20 at the standard test locations and at the 112T location. Mien permitted by the applicable product specification, coupons for all tests shall be obtained from the 111T location only. If required. 1!2T specimens shall be used for hot tensile tests
NOTE If multi,le plates are ait from one motherplate ordy one set of specimens from the motherplate e required.
b) Forging—From each heat transverse to the major working direction in accordance with SA-182 or SA-336, and test specimens shaM be taken at 112T of the prolongation or of a separate test block. A separate test block, if used. shall be made from the same heat and shall receive substantially the same reduction and type of hot working as the production forgings that it represents and shall be of the same nominal thickness as the production forgings The separate test forging shall be heat treated in the same fumace charge and under the same conditions as the production forgings.
c) Pipe—From each heat and lot of pipe, transverse to the major working direction in accordance SA 530 except that test specimens shall be taken from 1111.
5.5.2 TensIle Test RequIrements
5.52.1 Tensile testing of plates and forging materials shall comply with the applicable code(s) and the following additional requirements.
5.52.2 Test coupon shall be heat treated to represent the maximum post-weld heat treatment per 316.
5.52.3 Tensile properties at room temperattse shall meet the requirements of the applicable code(s).
5.5.3 Impact Testing Requirements
Charpy V-notch (CVN) Impact testing shall be performed for all 1114Cr-½Mo steel material used for pressure containing components except bolting. CVN Impact tests shall comply with the applicable code(s) and the following additional reqLirements.
a) Test coupons from forgings shall be oriented transverse to the major direction of metal flow.
b) Test coupons heat treated to represent both the minimum and maximum post-weld heat treatments per 3.1.7 and 3.1.6 shall be tested and meet the following requirements. The minimum CVN impact values shall be 40 ft-’bs (54 Joules) average of three specimens at 0 F (—18 °C) and 20 ft4bs (27 Joules) minimum for a single specimen at 0 °F (—18 CC). In addition, if the MDMT is <0 F (—18 CC). Code requirements for impact testing must also be met. If the toughness levels at the MDMT of <0 F (<-18 C) meet the toughness criteria levels (40120 ft.lbs) listed above. retesting at 0 F (—18 C) is not needed C) Lateral expansion and percent shear shall also be reported for information. 6 Welding Consumable Requirements 6.1 Material Requirements 6.1.1 The deposited weld metal, from each lot or batch of welding electrodes and each heat of mler wwes. and each combination of flier wire and flux, shall match the nommal chemical composition of the base metal to be welded. 6.12 The following chemical composition limits shall be controlled to improve resistance to reheat cracking. The chemical composition restriction applies to the heat analysis. X-bar = (lOP + SSb + 4Sn + As)i 100 s12 P. Sb, Sn, and As are In ppm C is0.15%maximum Cu is 0.20 % maximum Ni Is 0.30 % maximum 6.1.3 Low hydrogen welding consumables, including fluxes, having a maximum of 8 ml of diffusible hydrogen for every 100 g of weld metal, per AWS A4.3, shall be used. They shall be baked, stored, and used m accordance with manufacturers instructions (holding in electrode oven, length of time out of oven, etc). 6.2 Mechanical Requirements 62.1 Tensile Properties The tensile properties of the deposited weld metal shall meet those of the base metal in accordance with 5.5.2. 62.2 Impact Properties Prior to the start of fabrication, each lot of electrodes, heat of filler wire, and combwialion of lot of flux and heat of wire. shall be screened by impact testing of weld deposit in accordance with 55.3. 7 Welding, Heat Treatment and Production Testing 7.1 General Welding Requirements 7.1.1 Base metal surfaces prior to welding or applying weld overlay shall consist of clean metal, prepared by machining, grinding or blast cleaning.


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