ASME Reference Tables

ASME High-Temperature Pipe Specification Tables — SA-106 / SA-335

Chemical composition and mechanical properties for SA-106 seamless carbon steel pipe (Grades A, B, C) and SA-335 ferritic alloy-steel pipe (P1, P2, P5, P9, P11, P12, P22, P91) per ASME BPVC Section II Part A 2023.

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SA-106 and SA-335 Seamless Pipe Specifications

SA-106 and SA-335 are the two primary ASME specifications for seamless high-temperature service pipe. SA-106 covers plain carbon steel for general steam and process piping up to ~425°C. SA-335 covers ferritic alloy grades (P1 through P91) for higher-temperature service where the addition of Cr and Mo is required to maintain allowable stress values — up to ultra-supercritical conditions for P91 (9Cr-1Mo-V) and P92 (9Cr-1Mo-V-W).

Both specifications cover pipe ordered to NPS (nominal pipe size) and schedule per ASME B36.10M. Dimensions are not repeated here — see the ASME B36.10M Schedule Chart for wall thickness and weight by NPS and schedule.

Table data verified 2026-07-01 — ASME BPVC Section II Part A 2023.

SA-106

Seamless Carbon Steel Pipe for High-Temperature Service

Identical with ASTM A106-19a

Grades: Grade A, Grade B, Grade C

Alloy system: Plain carbon steel (Cr, Cu, Mo, Ni, V residuals only)

Size range: NPS ⅛ through NPS 48 (per ASME B36.10M)

Heat treatment: Normalized (≥ 900°C / 1650°F). Not quenched and tempered.

Application: Steam piping, boiler feed water, process headers up to ~425°C. Most common: Grade B.

Grade B is the industry default for carbon steel pipe in power and process plants. Grade C provides higher strength where wall reduction is beneficial.

SA-335

Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service

Identical with ASTM A335/A335M-18

Grades: P1, P2, P5, P9, P11, P12, P22, P91

Alloy system: Ferritic Cr-Mo (0.5Mo to 9Cr-1Mo-V for ZC supply grades)

Size range: NPS ⅛ and larger (dimensions per ASME B36.10M)

Heat treatment: Anneal or normalize and temper. P91: normalize 1040–1080°C, temper 730–800°C.

Application: High-temperature steam headers, main steam lines, hot-reheat piping above 400°C. P91 for ultra-supercritical boilers above 620°C.

ZC supplies P1, P2, P5, P9, P11, P12, P22, P91. P92 and other grades available on request.

SA-106 and SA-335 Mechanical Properties Quick Reference — UTS, Yield Strength, Elongation and Alloy System per Grade (ASME BPVC Section II Part A 2023)
Spec	Grade	UNS	UTS min (MPa)	YS min (MPa)	Elong min %	Alloy
SA-106	A	—	330 (48 ksi)	205 (30 ksi)	35	Carbon steel
SA-106	B	—	415 (60 ksi)	240 (35 ksi)	30	Carbon steel, most common
SA-106	C	—	485 (70 ksi)	275 (40 ksi)	30	Carbon steel, high strength
SA-335	P1	K11522	380 (55 ksi)	205 (30 ksi)	30	0.5Mo, no Cr
SA-335	P2	K11547	380 (55 ksi)	205 (30 ksi)	30	0.5Cr-0.5Mo
SA-335	P5	K41545	415 (60 ksi)	205 (30 ksi)	30	5Cr-0.5Mo
SA-335	P9	K90941	415 (60 ksi)	205 (30 ksi)	30	9Cr-1Mo (no V)
SA-335	P11	K11597	415 (60 ksi)	205 (30 ksi)	30	1.25Cr-0.5Mo
SA-335	P12	K11562	415 (60 ksi)	220 (32 ksi)	30	1Cr-0.5Mo
SA-335	P22	K21590	415 (60 ksi)	205 (30 ksi)	30	2.25Cr-1Mo
SA-335	P91	K91560	585 (85 ksi)	415 (60 ksi)	20	9Cr-1Mo-V ferritic (martensitic)

Source: SA-106 Table 2; SA-335 Table 3. ASME BPVC Section II Part A 2023.

Showing 11 of 11 grades

SA-106 and SA-335 Chemical Composition — Heat Analysis Requirements for C, Mn, P, S, Si, Cr, Mo by Grade (ASME BPVC Section II Part A 2023)
Spec	Grade	UNS	C (%)	Mn (%)	P max (%)	S max (%)	Si (%)	Cr (%)	Mo (%)	Alloy System
SA-106	A	—	0.25 max	0.27–0.93	0.035	0.035	0.10 min	0.40 max	0.15 max	Carbon steel
SA-106	B	—	0.30 max	0.29–1.06	0.035	0.035	0.10 min	0.40 max	0.15 max	Carbon steel, most common
SA-106	C	—	0.35 max	0.29–1.06	0.035	0.035	0.10 min	0.40 max	0.15 max	Carbon steel, high strength
SA-335	P1	K11522	0.10–0.20	0.30–0.80	0.025	0.025	0.10–0.50	—	0.44–0.65	0.5Mo, no Cr
SA-335	P2	K11547	0.10–0.20	0.30–0.61	0.025	0.025	0.10–0.30	0.50–0.81	0.44–0.65	0.5Cr-0.5Mo
SA-335	P5	K41545	0.15 max	0.30–0.60	0.025	0.025	0.50 max	4.00–6.00	0.45–0.65	5Cr-0.5Mo
SA-335	P9	K90941	0.15 max	0.30–0.60	0.025	0.025	0.25–1.00	8.00–10.00	0.90–1.10	9Cr-1Mo (no V)
SA-335	P11	K11597	0.05–0.15	0.30–0.60	0.025	0.025	0.50–1.00	1.00–1.50	0.44–0.65	1.25Cr-0.5Mo
SA-335	P12	K11562	0.05–0.15	0.30–0.61	0.025	0.025	0.50 max	0.80–1.25	0.44–0.65	1Cr-0.5Mo
SA-335	P22	K21590	0.05–0.15	0.30–0.60	0.025	0.025	0.50 max	1.90–2.60	0.87–1.13	2.25Cr-1Mo
SA-335	P91	K91560	0.08–0.12	0.30–0.60	0.020	0.010	0.20–0.50	8.00–9.50	0.85–1.05	9Cr-1Mo-V ferritic (martensitic)

Source: SA-106 Table 1; SA-335 Table 1. ASME BPVC Section II Part A 2023. SA-106 Cr, Mo, Ni, Cu, V values shown are maximum residual limits; they are not intentional additions. SA-335 values are heat analysis requirements.

SA-106 Combined Residuals Limit For SA-106, the sum of Cr + Cu + Mo + Ni + V shall not exceed 1.00% (heat analysis) or 1.10% (product analysis). This prevents the pipe from accumulating alloy additions that would affect weldability or heat treatment without being classified as an alloy grade.

Showing 11 of 11 grades

SA-106 and SA-335 Mechanical Properties — Tensile Strength, Yield Strength, Elongation and Hardness by Grade (ASME BPVC Section II Part A 2023)
Spec	Grade	UNS	UTS min (ksi)	UTS min (MPa)	YS min (ksi)	YS min (MPa)	Elong min (%)	Hardness	Elong Direction
SA-106	A	—	48	330	30	205	35	—	Longitudinal
SA-106	B	—	60	415	35	240	30	—	Longitudinal
SA-106	C	—	70	485	40	275	30	—	Longitudinal
SA-335	P1	K11522	55	380	30	205	30	—	Longitudinal
SA-335	P2	K11547	55	380	30	205	30	—	Longitudinal
SA-335	P5	K41545	60	415	30	205	30	—	Longitudinal
SA-335	P9	K90941	60	415	30	205	30	—	Longitudinal
SA-335	P11	K11597	60	415	30	205	30	—	Longitudinal
SA-335	P12	K11562	60	415	32	220	30	—	Longitudinal
SA-335	P22	K21590	60	415	30	205	30	—	Longitudinal
SA-335	P91	K91560	85	585	60	415	20	190–250 HBW	Longitudinal

Source: SA-106 Table 2; SA-335 Table 3. ASME BPVC Section II Part A 2023. YS = 0.2% offset yield strength. Basic elongation in 2 in. (50 mm) gauge length. SA-335 computed minimum elongation for thinner walls per Table 4 and Table 5 of the specification.

SA-106 Elongation Formula For SA-106, elongation is computed from the formula: E = 48t + 15.00 (longitudinal, all grades). Where t = actual wall thickness in inches and E = minimum elongation in %. The basic 30–35% values apply to full-thickness specimens; thinner walls have a proportionally lower requirement. SA-335 uses a similar formula: E = 48t + 15.00 for all grades except P23, P36, and P91.

Heat Treatment Requirements

SA-106 and SA-335 Heat Treatment Requirements — Delivery Condition, Normalizing and Tempering Temperatures by Grade (ASME BPVC Section II Part A 2023)
Spec	Grade	Required Condition	Normalizing Temp	Temper Temp
SA-106	A / B / C	Normalized	≥ 900°C [1650°F]	Not required
SA-335	P1	Full/isothermal anneal OR normalize and temper OR subcritical anneal	—	650°C [1200°F] or 650–705°C [1200–1300°F]
SA-335	P2	Full/isothermal anneal OR normalize and temper OR subcritical anneal	—	675°C [1250°F] or 650–705°C [1200–1300°F]
SA-335	P5	Full/isothermal anneal OR normalize and temper	—	≥ 675°C [1250°F]
SA-335	P9	Full/isothermal anneal OR normalize and temper	—	≥ 675°C [1250°F]
SA-335	P11	Full/isothermal anneal OR normalize and temper	—	≥ 650°C [1200°F]
SA-335	P12	Full/isothermal anneal OR normalize and temper OR subcritical anneal	—	650°C [1200°F] or 650–705°C [1200–1300°F]
SA-335	P22	Full/isothermal anneal OR normalize and temper	—	≥ 675°C [1250°F]
SA-335	P91	Normalize and temper or quench and temper	1040–1080°C [1900–1975°F]	730–800°C [1350–1470°F]

Source: SA-106 §5.3; SA-335 Table 2. ASME BPVC Section II Part A 2023. SA-106 requires normalization only — quench and temper is not permitted unless agreed between purchaser and manufacturer.

Grade Selection by Service Temperature

SA-106 and SA-335 Grade Selection by Service Temperature Range
Temperature Range	Recommended Grade	Notes
Up to 370°C (700°F)	SA-106 Grade B	Plain carbon steel sufficient. Most economical choice.
370–425°C (700–800°F)	SA-106 Grade B or SA-335 P1	P1 (0.5Mo) has marginally better creep resistance.
425–510°C (800–950°F)	SA-335 P1 or P2	Alloy grades recommended. P2 (0.5Cr-0.5Mo) preferred.
510–570°C (950–1060°F)	SA-335 P11 or P12	1Cr-Mo grades. P11 is most common in power plants.
570–620°C (1060–1150°F)	SA-335 P22	2.25Cr-1Mo — standard for this temperature range.
Above 620°C	SA-335 P91 / P92	9Cr-Mo-V/W grades for ultra-supercritical conditions. Available on request.

Temperature limits are indicative based on creep onset. Allowable stress values in ASME BPVC Section II Part D govern actual design pressure calculations.

SA-106 vs SA-335 — Key Differences

SA-106 vs SA-335 — Alloy Content, Heat Treatment, Temperature Limit, Weldability and PWHT Requirements Compared
Property	SA-106	SA-335
Alloy content	Plain carbon (Cr, Mo as residuals only)	Intentional Cr and/or Mo addition
Heat treatment	Normalized only (≥ 900°C)	Anneal or normalize + temper (650–675°C)
Max service temp	~425°C (800°F)	Up to 620°C+ depending on grade
Weldability	Good. Preheat not required for most walls	Preheat required; PWHT mandatory for Cr-Mo grades
Hardness limit	Not specified in standard	Not specified in standard for most grades
NDE	Hydrostatic test standard; UT optional	Hydrostatic or UT/EC. Hydrostatic mandatory >10 in. OD
P-number (ASME)	P-No. 1 (carbon steel)	P-No. 3 (1Cr-0.5Mo, 0.5Cr-0.5Mo) or P-No. 5 (Cr > 2%)

SA-335 Pipe vs SA-213 Tube — Same Composition, Different Form

SA-335 P-grades share nearly identical chemical composition with SA-213 T-grades of the same alloy system — the difference is product form (pipe vs tube). Note: T91 and P91 are NOT identical UNS designations. T91 = K90901 with C 0.07–0.14%; P91 Type 1 = K91560 with C 0.08–0.12%. The compositions are very similar but not interchangeable without referencing the specific standard.

SA-335 High-Temperature Pipe vs SA-213 Boiler Tube — Grade Equivalents by Alloy System and UNS Number
Alloy System	Tube Grade (SA-213)	Pipe Grade (SA-335)	UNS
0.5Cr-0.5Mo	T2	P2	K11547
1.25Cr-0.5Mo	T11	P11	K11597
1Cr-0.5Mo	T12	P12	K11562
2.25Cr-1Mo	T22	P22	K21590
9Cr-1Mo-V	T91	P91	K90901 / K91560 ★

PWHT Requirements for SA-335 Cr-Mo Grades Post-weld heat treatment (PWHT) is mandatory when welding SA-335 P11, P12, and P22 pipe, regardless of wall thickness, under ASME B31.1 Power Piping and ASME B31.3 Process Piping. Minimum PWHT temperatures: P11/P12 — 650°C [1200°F]; P22 — 675°C [1250°F]. Hold time is typically 1 hour per inch (25 mm) of wall thickness, minimum 15 minutes. Failure to PWHT creates a hardened heat-affected zone susceptible to stress-corrosion cracking and creep damage.

Frequently Asked Questions

What is the difference between SA-106 and SA-335?

SA-106 is a plain carbon steel seamless pipe for high-temperature service (Grades A, B, and C). It contains no intentional Cr or Mo and is supplied in the normalized condition. SA-335 is a seamless ferritic alloy-steel pipe that adds Cr and Mo in various proportions (P1 adds Mo only; P2 adds 0.5Cr-0.5Mo; P11 adds 1.25Cr-0.5Mo; P22 adds 2.25Cr-1Mo). SA-335 grades are used when service temperatures exceed the useful range of carbon steel, typically above 400°C.

What is SA-106 Grade B used for?

SA-106 Grade B is the most common grade for high-temperature steam piping, process piping, and structural applications requiring seamless carbon steel pipe. It provides minimum 415 MPa (60 ksi) tensile strength and 240 MPa (35 ksi) yield strength. Typical applications include steam distribution headers, boiler feed water piping, and general process piping up to approximately 425°C (800°F). Grade B is the default selection when alloy grades are not required by the design temperature or pressure.

What heat treatment is required for SA-335 P22 pipe?

SA-335 P22 (2.25Cr-1Mo) must be supplied in either the full or isothermal annealed condition, or the normalized and tempered condition, with a minimum tempering temperature of 1250°F (675°C). The normalize-and-temper condition is preferred for better mechanical properties. Post-weld heat treatment (PWHT) is mandatory when welding P22 — minimum 675°C for all wall thicknesses per ASME B31.1 and ASME B31.3.

Can SA-106 Grade B pipe be used for sour service?

SA-106 Grade B carbon steel pipe can be used in H2S sour service, subject to NACE MR0175/ISO 15156 requirements. The key constraint is hardness: the as-normalized hardness of SA-106 Grade B is typically well below the 22 HRC (237 HBW) limit for carbon steel in sour service. However, weld seams and heat-affected zones must also meet the hardness limit after PWHT. SA-106 Grade B is generally acceptable in NACE Region 0 and Region 1 environments without special restrictions.

What is the maximum temperature for SA-335 P11 pipe?

SA-335 P11 (1.25Cr-0.5Mo) is used in power plant piping up to approximately 570°C (1060°F). The published allowable stress values in ASME BPVC Section II Part D govern actual design limits. P11 is widely used in main steam and hot-reheat piping in conventional subcritical power plants. For temperatures above 570°C, P22 (2.25Cr-1Mo) or P91 (9Cr-1Mo-V) are required.

What is the difference between SA-335 P11 and P12?

SA-335 P11 (1.25Cr-0.5Mo) and P12 (1Cr-0.5Mo) are similar Cr-Mo alloy pipe grades with slightly different chromium content. P11 has Cr 1.00–1.50% and Si 0.50–1.00%; P12 has Cr 0.80–1.25% and Si 0.50% max. P12 also has a slightly higher minimum yield strength (220 MPa vs 205 MPa). P12 is sometimes preferred in European practice (equivalent to 13CrMo4-5 per EN 10216-2), while P11 is the dominant grade in North American power plant piping.

Related Specification Tables

→ SA-192/209/210/213 Boiler Tube Spec Tables → ASME B36.10M Pipe Schedule Chart → API 5CT Casing & Tubing Specification Tables → API 5L Line Pipe Specification Tables → NACE MR0175 Sour Service Material Tables

Supply Enquiry — ZC Steel Pipe

ZC Steel Pipe supplies seamless high-temperature pipe to SA-106 (A/B/C), SA-335 (P1/P2/P5/P9/P11/P12/P22/P91), GB 9948, GB 6479, EN 10216-2, and DIN 17175. Provide your specification, grade, NPS, schedule or wall thickness, length, and quantity. We respond within one business day.

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Data Source & Disclaimer: All specification data is sourced from ASME BPVC Section II Part A 2023. Tables are provided as engineering reference only. Always verify critical values against the current ASME standard before use in pressure piping design. Not all grade/size combinations are stocked — contact us to confirm availability.