1. General Terms
① delivery status
Refers to the final delivery of products or final heat treatment of plastic deformation state. Generally not heat-treated hot-rolled or cold drawn, said delivery (rolled) state or manufactured state; after delivery of the said heat treatment
Heat treatment, or under the category called normalizing heat treatment (normalization), quenching, solution, annealed. Order, the delivery status required in the contract.
② the actual weight of shipment or delivery according to theoretical weight
Actual weight – delivery, the weight of their products is based on weight (weighing) weight delivery;
Theoretical weight – delivery, the weight of their products is based on the nominal size steel weight calculated. The formula is as follows (theoretical weight required by the delivery person is required in the contract):
Stainless steel pipe weight per meter of the theory (the density of steel is 7.85kg/dm3) formula:
W = 0.02466 (D-S) S
The formula: W – stainless steel pipe fittings theoretical weight per meter, kg / m;
D – stainless steel pipe fittings of nominal diameter, mm;
S – stainless steel pipe fittings of nominal wall thickness, mm.
③ guarantee conditions
The provisions of the current standard test items and to ensure compliance with the standard specification, called the guarantee conditions. Ensure that the terms be divided into:
A, the basic guarantee conditions (also known as a necessary condition). Regardless of whether the customers in the contract. Standards required by the provisions of the inspection, and to ensure test results meet the standard requirements.
Such as chemical composition, mechanical properties, size deviation, surface quality and inspection, pressure test or flattening or flaring process performance such experiments are a necessary condition.
B, the agreement guarantees conditions: standard conditions, in addition to the basic guarantees, there are “demand-side requirements based upon mutual agreement of supply and demand, and in the contract note? Quot; or” When the demand side requirements … … should be
In the contract “; also customers, the basic guarantee of the standard conditions of tightening the requirements (such as composition, mechanical properties, size deviation, etc.) or by test items (such as stainless steel pipe fittings
Ellipticity, uneven wall thickness, etc.). The terms and requirements, in order, by the supply and demand by the two sides signed the agreement supply technology and in the contract. Therefore, these conditions are also known as the Association
Conditions of the proposed guarantee. There is an agreement to ensure conditions for the product, as have to follow suit.
④ approved
Standard in the “batch” refers to a test unit, the inspection lot. If approved delivery unit group, said the consignments. When large quantities of delivery, a delivery batch can consist of several inspection lot; when the delivery volume
Is low, a test batch can be divided into several delivery batch.
“Batch” is usually composed of the following provisions (see the standard):
A, each batch should be the same grade (steel grade), with furnaces (tank) number or numbers with the mother furnace, with specifications and with the heat treatment system (furnace) is composed of stainless steel pipe fittings.
B, for high quality carbon steel pipe, fluid pipe, can be different furnaces (pot) in the same grade, with the specifications and the same heat treatment (furnace) is composed of stainless steel pipe fittings.
C, welded stainless steel pipe fittings each batch should be the same grade (Grade), stainless steel tube with standard composition.
⑤ high quality steel and high-quality steel
In GB/T699-1999 and GB/T3077-1999 standards, with the back of his trademark “A” character who, for the high quality steel, contrary to the general high quality steel.
High quality steel in the following part or all of superior quality steel:
A, narrowing the range of ingredients;
B, to reduce the harmful elements (such as sulfur, phosphorus, copper) content;
C, to ensure high purity (which requires less non-metallic inclusion content);
D, ensure high mechanical properties and processing properties.
⑥ vertical and horizontal
Standard said longitudinal direction is parallel with the processing (ie processing along the direction of) persons; horizontal direction is perpendicular with the processing (processing the stainless steel tube axial direction).
Impact work to do experiment, vertical fracture of the specimen and processing for the vertical direction. It is called horizontal fracture; transverse fracture of the sample parallel to the direction for and processing, so that vertical fracture.
