API SPEC 7HU2 pdf download

API SPEC 7HU2 pdf download Oilfield Hammer Unions
5Materials
5.1General
The materials for segment retainer rings, resilient seals, pressure-containing parts, and pressure-retaining partsshall satisfy the requirements below.All metallic materials shall have a wrought microstructure throughout.
5.2Segment Retainer Ring
Segment retainer rings shall be made of material meeting the functional requirements of 4.2.4.5.3Resilient Seal
The resilient seal shall be made of non-metallic material, though a metallic anti-extrusion ring may be includedin the resilient seal. The resilient seal shall require a written material specification. The manufacturer’s writtenspecification for resilient seal non-metallic materials shall define the following:
-generic base polymer(s);
NOTE ASTM D1418 provides standardized nomenclature for rubber polymers.-physical property requirements;
-documentation requirements as specified in 7.5.2.2;- storage and age-control requirements.
The resilient seal shall be manufactured from materials which meet the requirements in the written materialspecification.Seals with integral anti-extrusion devices should be used at working pressures of greater than orequal to 15,000 psi (103.5 MPa).
5.4Metallic Pressure-containing and Pressure-retaining Parts5.4.1 General
Weld repair of material or product shall not be performed at any point in the manufacturing process.5.4.2 Written Material Specification Requirements
All metallic pressure-containing and pressure-retaining parts shall require a written material specification. Therequirements in 5.3 shall be defined in the written material specification.
All pressure-containing and pressure-retaining parts shall be manufactured from materials which meet therequirements in the written material specification.
5.4.3 Union Nuts
Union nuts shall be produced from a single-piece forging.5.4.4 Hot-working Practices
Materials formed using hot-working practice(s) shall result in a reduction ratio of at least 3:1 . In addition, thereduction ratio shall be documented.
5.4.5 Melting Practices
The manufacturer shall specify the melting practices.5.4.6 Heat-treating
The manufacturer shall specify the heat-treatment method for the material (such as quench and temper;normalize, quench, and temper).
NOTE The manufacturer is not required to specify the times and temperatures for heat-treatment.
All heat-treating of material, parts, and qualification test coupons (QTC)shall be performed with “production type”heat-treating equipment qualified in accordance with a recognized industry standard, such as API 6A,SAEAMS2750，SAE AMSH6875, or ASTMA991.
“Production type” heat-treating equipment shall be considered equipment that is routinely used to processproduction parts having an equivalent round (ER) equal to or greater than the ER of the subject QTc.
5.4.7Chemical Composition
The manufacturer shall specify the chemical composition and composition tolerances of the material.
Material composition shall be determined on a heat basis (or a remelt ingot basis for remelt grade materials) inaccordance with a nationally or internationally recognized standard.
5.4.8 Material Qualification Testing
5.4.8.1General
The required tensile and impact tests shall be performed on specimens from a QTC.NOTE The QTC may be a separately forged test coupon, a sacrificial part, or a prolongation.
The QTC shall meet all APl 6A PSL 1 QTC requirements for bodies, bonnets, and end and outlet connections.
All sour service nut material and pressure-containing part materials shall meet the requirements for 75K material,as shown in Table 4,and shall meet the material processing and material property requirements of NACEMR0175/ISO15156.
All standard service nut material and pressure-containing part materials shall meet the requirements for 95Kmaterial, as shown in Table 4, except for standard service Figure 602,which shall meet the requirements foreither 75K or 95K materials.
All nut retainer segment materials shall meet the requirements for 95K material, as shown in Table 4.