GB/T 20878-2007 English PDF (GBT20878-2007)

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GB/T 20878-2007: Stainless and heat-resisting steels -- Designation and chemical composition
GB/T 20878-2007
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.20
H40
Replacing GB/T 4229-1984
Stainless and heat-resisting steels –
Designation and chemical composition
ISSUED ON. MARCH 9, 2007
IMPLEMENTED ON. OCTOBER 1, 2007
Issued by. General Administration of Quality Supervision, Inspection;
Quarantine of the People's Republic of China (GAQSIQ);
Standardization Administration of China (SAC).
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Terms and definitions ... 4 
3 General rules for identifying chemical constitution limits ... 5 
4 Chemical composition and application of stainless steel and heat resisting steel ... 7 
Annex A ... 21 
Annex B ... 27 
Annex C ... 34 
References ... 42 
Foreword
Chemical constitution limit and designation time specified in this Standard is
applicable to formulate and revise product standard for stainless steel and refractory
steel (including steel ingot and half-finished product).
This Standard needs to be used with other technical standards; it can not be used for
ordering.
This Standard replaces GB/T 4229-1984 “Methods of weight calculation of stainless
steel plates and sheets" since the date of implementation.
Annex A, Annex B and Annex C of this Standard are informative.
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of national steel standardization technical
committee.
Drafting organization of this Standard. China Metallurgical Information Standardization
Research Institute.
Main Drafters of this Standard. Luan Yan, Dai Qiang and Liu Baoshi.
Stainless and heat-resisting steels –
Designation and chemical composition
1 Scope
This Standard specifies the designation and its chemical constitution of stainless steel
and heat resisting steel (see Table 1 ~ Table 5). Physical parameter of some
designations, overseas standards designation or approximate designation parallel
table, stainless steel and heat resisting steel designation criterion of acceptability are
specified in the Informative Annex.
Chemical constitution limit and its designation time specified in this Standard are
applicable to formulating and revising the product standard for stainless steel and its
refractory steel (including steel ingot and its half-finished product).
2 Terms and definitions
The following terms and definitions are applicable to this Standard.
2.1
Stainless steel
Steel that does not rust and corrosion-resistant, of which the chromium content is at
least 10.5%, carbon content is at least 1.2%.
2.1.1
Austenitic grade stainless steel
Stainless steel of which the base is with face-centered cubic crystal austenite
structure (gamma phase), antimagnetic. This kind of stainless steel is intensified (may
cause magnetism) through cold-working.
2.1.2
Austenitic-ferritic (duplex) grade stainless steel
Stainless steel of which the base is with austenite and ferrite (one with less phrase is
more than 15%). The stainless steel is with magnetic property and can be intensified
through cold-working.
2.1.3
Ferritic grade stainless steel
Stainless steel of which the base is with space centered cubic lattice iron chain tissue
(alpha phase) and with magnetic property. It cannot be hardened through heat
treatment, but cold-working can lightly intensify it.
2.1.4
Martensitie grade stainless steel
Stainless steel of which the base is the magnetic martensitic structure. Through heat
treatment, mechanical property can be adjusted.
2.1.5
Precipitation hardening grade stainless steel
Stainless steel of which the base is austenite or martensitic structure. it can be
hardened through precipitation hardening (age hardening).
2.2
Heat-resisting steel
Steel with good chemical stability or higher strength at high temperature.
3 General rules for identifying chemical constitution
limits
3.1 Carbon
If carbon content is greater than or equal to 0.04%, it is recommended to take two
digits; if carbon content is not greater than 0.030%, it is recommended to take 3 digits.
3.2 Manganese
Apart from Cr-Ni-Mn, it is recommended to use 2.00% and 1.00% (maximum value),
but it does not include automatic steel containing high sulphur or selenium or steel
that need to raise nitrogen solid solubility.
3.3 Phosphor
Unless related producer recommend using lower limit due to technical reasons, it is
recommended to be with at minimum 0.045% phosphor for austenitic steel. Phosphor
content for other kind of steel shall not be greater than 0.040%, but is does not include
automatic steel.
3.4 Sulfur
Table 1 Austenitic grade stainless steel, heat resisting steel designation and its chemical composition
Serial
number
Unified
numerical name New designation Old designation
Chemical constitution (mass fraction)/%
C Si Mn P S Ni Cr Mo Cu N Other elements
1 S35350 12Cr17Mn6Ni5N 1Cr17Mn6Ni5N 0.15 1.00 5.50~7.50 0.050 0.030 3.50~5.50 16.00~18.00 — — 0.05~0.25 —
2 S35950 10Cr17Mn9Ni4N 0.12 0.80 8.00~10.50 0.035 0.025 3.50~4.50 16.00~18.00 — — 6.15~0.25 —
3 S35450 12Ci18Mn9Ni5N 1Ci18Mn8Ni5N 0.15 1.00 7.50~10.00 0.050 0.030 4.00~6.00 17.00~19.00 — — 0.05~0.25 —
4 S35020 20Cr13Mn9Ni4 2Cr13Mn9Ni4 0.15~0.25 0.80 8.00~10.00 0.035 0.025 3.70~5.00 12.00~14.00 — — — —
5 S35550 20Cr15Mn15Ni2N 2Cr15Mn15Ni2N 0.15~0.25 1.00 14.00~16.00 0.050 0.030 1.50~3.00 14.00~16.00 — — 0.15~0.30 —
6 S35650 53Cr21Mn9Ni2N 5Cr21Mn9Ni4Na 0.48~0.58 0.35 8.00~10.00 0.040 0.030 3.25~1.50 20.00~22.00 — — 0.35~0.50 —
7 S35750 26Cr18Mn12Si2Na 3Cr18Mn12Si2Na 0.22~0.30 1.40~2.20 10.50~12.50 0.050 0.030 — 17.00~19.00 — — 0.22~0.33 —
8 S35850 22Cr20Mn10Ni2Si2Na 2Cr20Mn9Ni2Si2Na 0.17~0.26 1.80~2.70 8.50~11.00 0.050 0.030 2.00~3.00 16.00~21.00 — — 0.20~0.30 —
9 S30110 12Cr17Ni7 1Cr17Ni7 0.15 1.00 2.00 0.045 0.030 6.00~5.00 16.00~18.00 — — 0.10 —
10 S30103 022Cr17Ni7 0.030 1.00 2.00 0.045 0.030 5.00~8.00 16.00~18.00 — — 0.20 —
11 S30153 022Cr17Ni7N 0.030 1.00 2.00 0.045 0.030 5.00~8.00 16.00~18.00 — — 0.07~0.20 —
12 S30220 17Cr18Ni9 2Cr18Ni9 0.13~0.21 1.00 2.00 0.035 0.025 8.00~10.50 17.00~19.00 — — — —
13 S30210 12Cr18Ni9a 1Cr18Ni9a 0.15 1.00 2.00 0.045 0.030 8.00~10.00 17.00~19.00 — — 0.10 —
14 S30240 12Cr18Ni9Si3a 1Cr18Ni9Si3a 0.15 2.00~3.00 2.00 0.045 0.030 8.00~10.00 17.00~19.00 — — 0.10 —
15 S30317 Y12Cr18Ni9 Y1Ci18Ni9 0.15 1.00 2.00 0.20 ≥0.15 8.00~10.00 17.00~19.00 (0.60) — — —
16 S30327 Y12Cr18Ni9Se Y1Cr18Ni9Se 0.15 1.00 2.00 0.20 0.060 8.00~10.00 17.00~19.00 — — — Se≥0.15
17 S30408 06Cr19Ni10a 0Cr18Ni9a 0.08 1.00 2.00 0.045 0.030 8.00~11.00 18.00~20.00 — — — —
18 S30403 022Cr19Ni10 00Cr19Ni10 0.030 1.00 2.00 0.045 0.030 8.00~12.00 18.00~20.00 — — — —
19 S30409 07Cr19Ni10 0.04~0.10 1.00 2.00 0.045 0.030 8.00~11.00 18.00~20.00 — — — —
20 S30450 05Cr19Ni10Si2CeN 0.04~0.06 1.00~2.00 0.80 0.045 0.030 9.00~10.00 18.00~19.00 — — 0.12~0.18 Ce0.03~0.08
21 S30480 06Cr18Ni9Cu2 0Cr18Ni9Cu2 0.08 1.00 2.00 0.045 0.030 8.00~10.50 17.00~19.00 — 1.00~3.00 — —
Table 2 Austenitic-ferritic type stainless steel designation and its chemical constitution
Serial
number
Unified
numerical
name
New designation Old designation
Chemical constitution (mass fraction)/%
C Si Mn P S Ni Cr Mo Cu N Other elements
67 S21860 14Cr18Ni11Si4AlTi 1Cr18Ni11Si4AlTi 0.10~0.18 3.10~1.00 0.80 0.035 0.030 10.00~12.00 17.50~19.50 — — — Ti0.40~0.70Al0.10~0.30
68 S21953 022Cr19Ni5Mo3Si2N 00Cr18Ni5Mo3Si2 0.030 1.30~2.00 1.00~2.00 0.03...