① condition of delivery
Refers to the state of the final plastic deformation or the final heat treatment of the delivered product.Generally, hot rolling or cold pull (rolling) state or manufacturing state: heat treatment state for delivery after heat treatment, or regular fire (normal), quality adjustment, solid solution, annealing state according to the category of heat treatment.When ordering, the delivery status shall be indicated in the contract.
② is delivered by actual weight or by theoretical weight
Actual weight-Upon delivery, the weight of the product is delivered by weighing (weighing) weight;
Theoretical weight-The product weight is the weight calculated from the nominal size of the steel.The calculation formula is as follows (required according to the theoretical weight, shall be indicated in the contract): the theoretical weight per meter (the density of steel is 7.85 k g/dms3) calculation formula:
Type w= (D-S) S: theoretical weight of T one steel pipe per meter, kg/m; nominal outer diameter of D-steel pipe, m: s nominal wall thickness of one steel pipe, m.
③ guarantee conditions
According to the current standard of the specified day of inspection and ensure the compliance of the standard, called the guarantee conditions.The guarantee conditions are also divided into:
A. Basic guarantee conditions (also known as compulsory guarantee conditions).Whether or not it is indicated in the contract.All the technical standards shall escape the inspection, and ensure that the inspection results meet the standard provisions.Such as chemical composition, mechanical properties, size deviation, surface quality and flaw detection, hydraulic test or pressure fan or expansion 1 1 and other process performance experiments, are required conditions.
B. Agreement guarantee conditions: Besides the basic guarantee conditions in the standard, there are ” negotiations between the two parties according to the requirements of the demander.And note it in the contract?The quot; or ” when the buyer wants it. Seek…, should be indicated in the contract “; some customers, the basic warranty requirements such as composition, mechanical properties, size deviation, etc.) or additional inspection items (such as steel pipe ellipticity, unequal wall thickness).The above terms and requirements, when ordering, the supply and demand parties shall negotiate, sign the supply technology agreement and indicate it in the contract.Therefore, these conditions are also known as the agreement guarantee conditions.For products with agreement guarantee conditions, the price should be increased.
④ write instructions or comments on
The “batch” in the standard refers to an inspection unit, namely the inspection batch.If the delivery unit group batch, called the delivery batch.When the delivery batch is large, each delivery batch can include several inspection batches: when the delivery batch is small, the inspection batch can be divided into several delivery batches.The composition of “batch” usually has the following provisions (see relevant standards):
A. Each batch shall be composed of steel pipes with the same brand number (steel grade), the same furnace (tank) number or the same mother furnace number, the same specification and the same heat treatment system (furnace times).
B. For high-quality carbon steel structural pipes and fluid pipes, different furnaces (tanks) can have the same brand number, the same specification and the same heat treatment system (furnace times). Composition of the steel pipe.
C. Each batch of welded steel pipe shall be composed of steel pipe with the same grade (steel grade) and the same specification.
⑤ quality steel and superior quality steel
In GB / T699-1999 and GB / T3077-1999 standards, its brand back with “A”, for high grade steel, otherwise high quality steel.Advanced quality steel is superior in some or all of the following:
A. Reduce the component content range:
B. Reduce the content of harmful elements (such as flow, phosphorus and steel):
c. defend
Shandong Jute Steel Pipe Co.,Ltd.
Contacts: Mr. Ji
WhatsApp: +86 18865211873
WeChat: +86 18865211873
E-mail: jutesteelpipe@gmail.com
E-mail: juteguanye@aliyun.com
Post time: Mar-10-2022
