ISO 9809-1-2019 pdf free.Gas cylinders一Design, construction and testing of refillable seamless steel gas cylinders and tubes一Part 1: Quenched and tempered steel cylinders and tubes with tensile strength less than 1 100 MPa.
Assessment of conformity to this international standard shall take into account the applicable regulations of the countries of use.
To ensure that cylinders conform to this document, they shall be subject to inspection and testing in accordance with Clauses 9. 10 and II.
Tests and examinations performed to demonstrate compliance with this document shall be conducted using instruments calibrated before being put into service and thereafter according to an established programme.
6 Materials
6.1 General requirements
6.1.1 Materials for the manufacture of gas cylinders shall fall within one of the following categories:
a) internationally recognized cylinder steels;
b) nationally recognized cylinder steels;
c) new cylinder steels resulting from technical progress.
For all categories, the relevant conditions specified in 2 and 6 shall be satisfied.
6.1.2 The material used for the manufacture of gas cylinders shall be steel, other than rimming quality with non-ageing properties and shall be fully killed with aluminium and/or silicon.
In cases where examination of this non-ageing property is required by the customer, the criteria by which it is to be specified should be agreed with the customer and inserted in the order.
6.1.3 The cylinder manufacturer shall establish means to identify the cylinders with the cast of steel from which they are made.
6.1.4 Grades of steel used for cylinder manufacture shall be compatible with the intended gas service, e.g. corrosive gases and embrittling gases (see ISO 111 14-1).
6.1.5 Wherever continuously cast billet material is used, the manufacturer shall ensure that there are no deleterious imperfections (porosity) in the material to be used for making cylinders (see 923).
6.2 Controls on chemical composition
6.2.1 The chemical composition of all steels shall be defined at least by:
一the carbon, manganese and silicon contents in all cases;
一the chromium, nickel and molybdenum contents or other alloying elements intentionally added to the steel;
一the maximum sulfur and phosphorus contents in all cases.
The carbon, manganese and silicon contents and, where appropriate, the chromium, nickel and molybdenum contents shall be given, with tolerances, such that the differences between the maximum and minimum values of the cast do not exceed the values shown in Table 1.
The combined content of the following elements: vanadium, niobium, titanium, boron and zirconium shall not exceed 0,15 %.
The actual content of any element deliberately added shall be reported and their maximum content shall be representative of good steel making practice. ISO 9809-1 pdf free download.
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