Q580 Series Quenched and Tempered High Strength Steel Plates for Pressure Equipment

Compliant with GB/T 713.6—2023 | Quenched + Tempered (Tempering ≥600℃) | High Strength Steel for Pressure Equipment | Including Q580R, Q580DR

Thickness Range: 10mm ~ 60mm (Q580R), 10mm ~ 50mm (Q580DR) | Vacuum Treated | Min Yield Strength: 580MPa | Impact Test: -20℃ (Q580R), -50℃ (Q580DR)

1 Scope

This document specifies the designation representation method, ordering content, dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of quenched and tempered high strength steel plates for pressure equipment. This document applies to quenched and tempered high strength steel plates (hereinafter referred to as steel plates) for pressure equipment with thickness of 10mm ~ 80mm.

2 Normative References

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the normative referenced document (including any amendments) applies.

No. Standard and Title
1 GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The diantipyrylmethane phosphomolybdate gravimetric method for the determination of phosphorus content
2 GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method
3 GB/T 223.14 Methods for chemical analysis of iron, steel and alloy - The tantalum reagent extraction photometric method for the determination of vanadium content
4 GB/T 223.17 Methods for chemical analysis of iron, steel and alloy - The diantipyrylmethane photometric method for the determination of titanium content
5 GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - The sodium thiosulfate separation-iodometric method for the determination of copper content
6 GB/T 223.23 Iron, steel and alloy - Determination of nickel content - Dimethylglyoxime spectrophotometric method
7 GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content - Thiocyanate spectrophotometric method
8 GB/T 223.40 Iron, steel and alloy - Determination of niobium content - Chlorosulfophenol S spectrophotometric method
9 GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The perchloric acid dehydration gravimetric method for the determination of silicon content
10 GB/T 223.63 Iron, steel and alloy - Determination of manganese content - Sodium periodate (potassium) spectrophotometric method
11 GB/T 223.68 Methods for chemical analysis of iron, steel and alloy - The potassium iodate titration method after combustion in a tube furnace for the determination of sulfur content
12 GB/T 223.69 Steel and iron - Determination of carbon content - Gas volumetric method after combustion in a tube furnace
13 GB/T 223.78 Methods for chemical analysis of iron, steel and alloy - The curcumin direct photometric method for the determination of boron content
14 GB/T 223.79 Iron and steel - Determination of multi-element contents - X-ray fluorescence spectrometry (routine method)
15 GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
16 GB/T 229 Metallic materials - Charpy pendulum impact test method
17 GB/T 232 Metallic materials - Bending test method
18 GB/T 247 General rule of package, mark and quality certification for steel plates and strips
19 GB/T 713.1 Steel plate, sheet and strip for pressure equipments - Part 1: General requirements
20 GB/T 2975 Steel and steel products - Location and preparation of samples for mechanical testing
21 GB/T 4336 Carbon steel and low-alloy steel - Determination of multi-element content - Spark discharge atomic emission spectrometric method (routine method)
22 GB/T 6803 Drop-weight tear test method for ferritic steels
23 GB/T 17505 Steel and steel products - General technical delivery requirements
24 GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition
25 GB/T 20123 Steel and iron - Determination of total carbon and sulfur content - Infrared absorption method after combustion in an induction furnace (routine method)
26 GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method
27 NB/T 47013.3 Non-destructive testing of pressure equipments - Part 3: Ultrasonic testing

3 Terms and Definitions

The terms and definitions defined in GB/T 713.1 apply to this document.

4 Designation Representation Method

The designation of steel is composed of: the Chinese pinyin initial "Q" for yield strength, the specified minimum yield strength value, the Chinese pinyin initial "R" for pressure vessel or "DR" for low temperature pressure vessel, and temperature grade "L", etc.

Example: Q490DRL1. Where: Q—Chinese pinyin initial for yield strength; 490—specified minimum yield strength in MPa; DR—Chinese pinyin initials for low temperature pressure vessel; L1—temperature grade, L1 represents -40℃ requirement, L2 represents -50℃ requirement.

5 Ordering Content

The ordering content of steel plates shall comply with GB/T 713.1.

6 Dimensions, Shape, Weight

The dimensions, shape and weight of steel plates shall comply with GB/T 713.1.

7 Technical Requirements

7.1 Designation and Chemical Composition

7.1.1 The designation and chemical composition (ladle analysis) of steel shall comply with Table 1. The chemical compositions of Q580R and Q580DR are shown in the table below.

Grade C Si Mn P S Cu Ni Cr Mo Nb V Ti B Pcm
Q580R ≤0.10 0.15～0.40 1.20～1.60 ≤0.015 ≤0.008 ≤0.25 ≤0.40 ≤0.50 0.10～0.30 ≤0.05 0.02～0.06 ≤0.03 ≤0.002 ≤0.25
Q580DR ≤0.005 0.30～0.60

7.1.2 The allowable deviation of chemical composition of finished steel plates shall comply with GB/T 713.1.

7.1.3 The welding cold crack sensitivity index (Pcm) of ladle analysis shall comply with Table 1. For Q580 series grades, Pcm ≤ 0.25%.

Note: Q580R and Q580DR have different requirements for P, S and Ni. Q580DR has stricter P (≤0.012% vs 0.015%) and S (≤0.005% vs 0.008%) limits, and higher Ni content (0.30～0.80% vs 0.30～0.60%).

7.2 Manufacturing Method

The manufacturing method of steel plates shall comply with GB/T 713.1 and shall be vacuum treated.

7.3 Delivery Condition

Steel plates shall be delivered in quenched and tempered (QT) condition, with tempering temperature not lower than 600℃.

7.4 Mechanical and Technological Properties

7.4.1 The general requirements for mechanical and technological properties of steel plates shall comply with GB/T 713.1.

7.4.2 The mechanical and technological properties of steel plates shall comply with Table 2. The mechanical properties of Q580R and Q580DR are shown in the table below.

Grade Thickness (mm) Tensile Test Impact Test 180° Bending Test
b=2a
Lower Yield Strength ReL/MPa (≥) Tensile Strength Rm/MPa Elongation A/% (≥) Temperature /℃ Impact Absorbed Energy KV2/J (≥) Lateral Expansion LE/mm (≥)
Q580R 10～60 580 690～820 ≥16 -20 ≥80 — D=3a
Q580DR 10～50 -50

7.4.3 Upon buyer's request and agreement between the supplier and the buyer, for steel plates with thickness greater than 36mm, an additional set of impact specimens may be taken at 1/2 thickness. The impact absorbed energy index shall be agreed upon by the supplier and the buyer.

7.4.4 Upon buyer's request, drop weight test may be carried out for steel plates with thickness greater than 36mm. The drop weight test method shall comply with GB/T 6803. The sampling quantity and specimen position shall be specified in the contract. The acceptance criteria for the drop weight test shall be agreed upon by the supplier and the buyer.

Note: D is bending plunger diameter; b is specimen width; a is specimen thickness.
When the yield phenomenon is not obvious, the specified plastic extension strength Rp0.2 shall be used.

7.5 Surface Quality

The surface quality of steel plates shall comply with GB/T 713.1.

7.6 Non-destructive Testing

Ultrasonic testing of steel plates shall be carried out according to NB/T 47013.3, and the acceptance level shall be not lower than Level I. Special requirements shall be specified in the contract.

7.7 Special Requirements

Upon agreement between the supplier and the buyer and specified in the contract, other special requirements may be proposed for the steel plates.

8 Test Methods

8.1 The chemical composition test of steel shall generally be carried out according to GB/T 4336, GB/T 20123, GB/T 20125 or general chemical analysis methods. In case of arbitration, it shall be carried out according to GB/T 223.3, GB/T 223.11, GB/T 223.14, GB/T 223.17, GB/T 223.18, GB/T 223.23, GB/T 223.26, GB/T 223.40, GB/T 223.60, GB/T 223.63, GB/T 223.68, GB/T 223.69, GB/T 223.78, GB/T 223.79.

8.2 The test methods for each batch of steel plates shall comply with Table 3.

No. Inspection Item Sample Quantity Sampling Method Sampling Direction Test Method
1 Chemical analysis 1 per heat GB/T 20066 — See 8.1
2 Tensile test 1 per batch GB/T 2975 Transverse GB/T 228.1
3 Impact test 3 per batch GB/T 2975 Transverse GB/T 229
4 Bending test 1 per batch GB/T 2975 Transverse GB/T 232
5 Drop weight test — GB/T 6803 — GB/T 6803
6 Ultrasonic testing Each plate — — NB/T 47013.3
7 Dimensions and shape Each plate — — Suitable measuring tools
Note: Tensile, impact and bending specimens shall be taken from the same test coupon. The test coupon shall be taken from 1/4 of the plate width. When the length of the steel plate after heat treatment is not greater than 15m, the test coupon shall be taken from one end of the plate; when the length is greater than 15m, test coupons shall be taken from both ends of the plate, and each test coupon shall be processed into a set of specimens (1 tensile, 3 impact and 1 bending). Shear or flame cutting methods may be used to cut the test coupon, but the size of the test coupon shall ensure that the specimens can avoid the work-hardened zone or heat-affected zone caused by shear or flame cutting.

9 Inspection Rules

9.1 Inspection and Acceptance: The inspection of steel plates shall be carried out by the supplier's quality inspection department.

9.2 Batch Formation: Steel plates shall be inspected in batches. Steel plates shall be batched by each heat treatment piece.

9.3 Sampling Quantity, Sampling Method and Sampling Direction: The sampling quantity, sampling method and sampling direction for each batch of steel plates shall comply with Table 3.

9.4 Re-inspection and Judgment Rules: The re-inspection and judgment rules of steel plates shall comply with GB/T 713.1.

9.5 Rounding of Numerical Values: Rounding of numerical values shall comply with GB/T 713.1.

10 Packaging, Marking and Quality Certificate

The packaging, marking and quality certificate of steel plates shall comply with GB/T 713.1.

Appendix A (Informative) Approximate Designation Comparison Between This Document and Foreign Standards

This Document ISO 9328-6:2018 JIS G 3115:2016 ASME SA-533/SA-533M-2021
Q580R — — SA-533 Type B Cl 3
Q580DR — — SA-533 Type E Cl 3
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