What are the terms of stainless steel pipe fittings?
September 26, 2018
General Terms
1. Delivery status refers to the state of final plastic deformation or final heat treatment of the delivered product. Hot rolled or cold drawn (rolled) state or manufacturing state without heat treatment delivery; heat treated state after heat treatment delivery, or normalizing, tempering, solid solution, annealing according to the type of heat treatment status. When ordering, the delivery status must be stated in the contract.
2.According to the actual weight delivery or delivery of the actual weight according to the theoretical weight--When delivered, the product's weight is delivered according to the weighing (pound) weight;
Theoretical Weight - The weight of the product at the time of delivery is calculated from the nominal size of the steel. The calculation formula is as follows (If delivery is required by theoretical weight, it must be specified in the contract):
The theoretical weight per meter of stainless steel pipe (steel density is 7.85kg/dm3)
W=0.02466(DS)S
Where: W-- theoretical weight per meter of stainless steel pipe, kg/m;
D - nominal diameter of stainless steel pipe, mm;
S--nominal wall thickness of stainless steel pipe, mm.
3. Guarantee conditions According to the provisions of the current standard, the project is to be inspected and guaranteed to meet the requirements of the standard, which is called the guarantee condition. Guarantee conditions are divided into:
A, basic guarantee conditions (also known as guaranteed conditions). Whether or not the customer stated in the contract. All of these tests must be carried out in accordance with the standards and ensure that the test results meet the standards.
Such as chemical composition, mechanical properties, dimensional deviations, surface quality, and flaw detection, water pressure testing, or flattening or flaring process performance tests, are guaranteed conditions.
B. Agreement guarantee conditions: In addition to the basic guarantee conditions in the standard, there are still “according to the requirements of the buyer, negotiated by the supply and demand sides, and note in the contract?” or “when the demander requests..., they should note in the contract. "Ming"; and other customers, put forward stringent requirements (such as composition, mechanical properties, size deviation, etc.) or increase inspection items (such as stainless steel pipe ellipticity, uneven wall thickness, etc.) for the basic guarantee conditions in the standard. In the case of an order, the supply and demand parties negotiate and sign the supply technical agreement and specify it in the contract.Thus, these conditions are also referred to as the guarantee conditions for the agreement.
The "batch" in the 4 batches of standards refers to a test unit, that is, an inspection lot. If batches are delivered in delivery units, they are called delivery batches. When the delivery volume is large, each delivery lot may include several inspection lots; when the delivery volume is small, inspection lots may be divided into several delivery batches.
4.The composition of a "batch" usually has the following provisions (see relevant standards for details):
A. Each batch shall consist of stainless steel pipes of the same grade (steel grade), the same furnace (tank) or the same mother and furnace number, the same specification and the same heat treatment system (heating times).
B. For high-quality carbon steel structural pipes and fluid pipes, they can be composed of stainless steel pipes of the same grade, same specification, and the same heat treatment system (heating) as different furnaces (cans).
C. Welded stainless steel fittings shall consist of stainless steel fittings of the same grade (steel grade) and of the same specification.
5. High-quality steels and high-grade steels In GB/T699-1999 and GB/T3077-1999 standards, those with "A" after the brand name are high-quality steels, and vice versa are high-quality steels.
High-quality steel is superior to high-quality steel in some or all of the following:
A, reduce the content range of ingredients;
B, reduce the harmful elements (such as *, phosphorus, copper) content;
C, to ensure a higher degree of purity (requires less content of non-metallic inclusions);
D, to ensure higher mechanical properties and process performance.
6. The longitudinal and transverse standards refer to the longitudinal direction as the direction parallel to the machining direction (ie, the direction of the downstream machining); the transverse direction refers to the direction perpendicular to the machining direction (the machining direction is the axial direction of the stainless steel pipe).
When the impact work was done, the fracture of the longitudinal specimen was perpendicular to the machining direction. Therefore, it is called transverse fracture; the fracture of transverse specimen is parallel to the processing direction, so it is called longitudinal fracture.
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